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In linguistics, coordination is a complex syntactic structure that links together two or more elements; these elements are called conjuncts or conjoins. The presence of coordination is often signaled by the appearance of a coordinator (coordinating conjunction), e.g. and, or, but (in English). The totality of coordinator(s) and conjuncts forming an instance of coordination is called a coordinate structure. The unique properties of coordinate structures have motivated theoretical syntax to draw a broad distinction between coordination and subordination. [1] It is also one of the many constituency tests in linguistics. Coordination is one of the most studied fields in theoretical syntax, but despite decades of intensive examination, theoretical accounts differ significantly and there is no consensus on the best analysis.
A coordinator or a coordinating conjunction, often appears between the conjuncts, usually at least between the penultimate and ultimate conjunct of the coordinate structure. The words and and or are by far the most frequently occurring coordinators in English. Other coordinators occur less often and have unique properties, e.g. but, as well as, then, etc. The coordinator usually serves to link the conjuncts and indicate the presence of a coordinate structure. Depending on the number of coordinators used, coordinate structures can be classified as syndetic, asyndetic, or polysyndetic.
Different types of coordinators are also categorised differently. The table below shows the categories for the coordinators in English: [2]
Coordinator | Category |
---|---|
and | conjunctive coordination |
or | disjunctive coordination |
but | adversative coordination |
Coordination is a very flexible mechanism of syntax. Any given lexical or phrasal category can be coordinated. The examples throughout this article employ the convention whereby the conjuncts of coordinate structures are marked using square brackets and bold script. In the following examples, the coordinate structure includes all the material that follows the left-most square bracket and precedes the right-most square bracket. The coordinator appears in normal script between the conjuncts.
Data of this sort could easily be expanded to include every lexical and phrasal category. An important aspect of the above data is that the conjuncts each time are constituents. In other words, the material enclosed in brackets would qualify as a constituent in both phrase structure grammars and dependency grammars.
Theoretical accounts of coordination vary in major respects. For instance, approaches to coordination in constituency and dependency differ significantly, and derivational and representational systems are also likely to disagree on many aspects of how coordination should be explained. Derivational accounts, for instance, are more likely to assume transformational mechanisms to "rectify" non-constituent conjuncts (e.g. conjunction reduction and RNR, as mentioned below).
Even concerning the hierarchical structure of coordinated strings, there is much disagreement. Whether or not coordinate structures should be analyzed in terms of the basic tree conventions employed for subordination is an issue that divides experts. Broadly speaking, there are two options: either a flat or a layered analysis. There are two possibilities for the flat option, both of which are shown here. The a-trees represent the analyses in a constituency-based system, and the b-trees in a dependency-based system:
The first two trees present the traditional exocentric analysis. The coordinate structure is deemed exocentric insofar as neither conjunct can be taken to be the sole head, but rather both conjuncts are deemed heads in a sense. The second two trees, where the coordinator is the head, are similar to the first two insofar as the conjuncts are equi-level sisters. These two flat analyses stand in contrast to the following three layered analyses. The constituency-based a-trees appear again on the left, and the dependency-based b-trees on the right:
The primary aspect of these layered analyses is that an attempt is being made to adapt the analysis of coordinate structures to the analysis of subordinate structures. The conjuncts in each case are NOT sister constituents, but rather the first conjunct is in a more prominent (higher) hierarchical position than the second conjunct. The three analyses differ with respect to the presumed head of the entire structure. The third option in terms of the X-bar schema cannot be rendered in terms of dependency because dependency allows a word to project just a single node. There is no way to capture the hierarchical distinction between specifiers and complements in a dependency-based system (but there is always a linear distinction, since specifiers precede complements).
The flat analysis has the benefit that it captures our intuition that coordinate structures are different from subordinate structures at a basic level. The drawback to the flat analysis, however, is that the theory of syntax must be augmented beyond what is necessary for standard subordinate structures. The layered analysis has the advantage that there is no need to augment the syntax with an additional principle of organization, but it has the disadvantage that it does not sufficiently accommodate our intuition that coordination is fundamentally different from subordination.
Most coordinate structures are like those just produced above; the coordinated strings are alike in syntactic category. There are a number of unique traits of coordination, however, that demonstrate that what can be coordinated is not limited to the standard syntactic categories. Each of the following subsections briefly draws attention to an unexpected aspect of coordination. These aspects are less than fully understood, despite the attention that coordination has received in theoretical syntax.
One coordinate structure can easily be nested inside another. However, this may result in ambiguity, as demonstrated by the following example.
The brackets indicate the three possible readings for the sentence. The (b)- and (c)-readings show one coordinate structure being embedded inside another. Which of the three readings is understood depends on intonation and context. The (b)-reading could be preferred in a situation where Bill and Sam arrived together, but Fred arrived separately. Similarly, the (c)-reading could be preferred in a situation where Fred and Bill arrived together, but Sam arrived separately. That the indicated groupings are indeed possible becomes evident when or is employed:
A theory of coordination needs to be in a position to address nesting of this sort.
The examples above illustrate that the conjuncts are often alike in syntactic category. [3] There are, though, many instances of coordination where the coordinated strings are NOT alike, e.g.
Data like these have been explored in detail. [4] They illustrate that the theory of coordination should not rely too heavily on syntactic category to explain the fact that in most instances of coordination, the coordinated strings are alike. Syntactic function is more important, that is, the coordinated strings should be alike in syntactic function. In the former three sentences here, the coordinated strings are, as complements of the copula is, predicative expressions, and in the latter two sentences, the coordinated strings are adjuncts that are alike in syntactic function (temporal adjunct + temporal adjunct, causal adjunct + causal adjunct).
The aspect of coordination that is perhaps most vexing for theories of coordination concerns non-constituent conjuncts. [5] Coordination is, namely, not limited to coordinating just constituents, but is also capable of coordinating non-constituent strings:
While some of these coordinate structures require a non-standard intonation contour, they can all be acceptable. This situation is problematic for theories of syntax because most of the coordinated strings do not qualify as constituents. Hence since the constituent is widely assumed to be the fundamental unit of syntactic analysis, such data seem to require that the theory of coordination admit additional theoretical apparatus. Two examples of the sort of apparatus that has been posited are so-called conjunction reduction and right node raising (RNR). [6] [7] Conjunction reduction is an ellipsis mechanism that takes non-constituent conjuncts to be complete phrases or clauses at some deep level of syntax. These complete phrases or clauses are then reduced down to their surface appearance by the conjunction reduction mechanism. The traditional analysis of the phenomenon of right node raising assumed that in cases of non-constituent conjuncts, a shared string to the right of the conjuncts is raised out of VP in such a manner that the material in the conjuncts ends up as constituents. The plausibility of these mechanisms is NOT widely accepted as it can be argued that they are ad hoc attempts to solve a problem that plagues theories that take the constituent to be the fundamental unit of syntactic analysis.
Coordination has been widely employed as a test or for the constituent status of a given string, i.e. as a constituency test. In light of non-constituent conjuncts however, the helpfulness of coordination as a diagnostic for identifying constituents can be dubious.
Gapping (and stripping) is an ellipsis mechanism that seems to occur in coordinate structures only. It usually excludes a finite verb from the second conjunct of a coordinate structure and allows further constituents to also be elided from the conjunct. [8] While gapping itself is widely acknowledged to involve ellipsis, which instances of coordination do and do not involve gapping is still a matter of debate. [9] Most theories of syntax agree that gapping is involved in the following cases. A subscript and a smaller font are used to indicate the "gapped" material:
Accounts of gapping and coordination disagree, however, concerning data such as the following:
The gapping analysis shown in the a-sentences is motivated above all by the desire to avoid the non-constituent conjuncts associated with the b-sentences. No consensus has been reached about which analysis is better.
Coordination is sensitive to the linear order of words, a fact that is evident with differences between forward and backward sharing. There is a limitation on material that precedes the conjuncts of a coordinate structure that does restrict the material that follows it: [10]
The star * indicates that the sentence is unacceptable in the language. Each of these coordinate structures is disallowed. The underline draws attention to a constituent that mostly precedes the coordinate structure but that the initial conjunct "cuts into". There is apparently a restriction on the constituents that mostly precede a coordinate structure. The same restriction does not limit similar constituents that mostly follow the coordinate structure:
The underline now marks a constituent that mostly follows the coordinate structure. Unlike with the first three examples, the coordinate structure in these three examples can cut into the underlined constituent.
In Transformational Grammar, the interaction of coordination and extraction (e.g. wh-fronting) has generated a lot of interest. The Coordinate Structure Constraint is the property of coordinate structures that prevents extraction of a single conjunct or from a single conjunct. Coordinate structures are said to be strong islands for extraction. [11] For example:
These attempts at coordination fail because extraction cannot affect just one conjunct of a coordinate structure. If extraction occurs out of both conjuncts in a like fashion, however, the coordinate structure is acceptable. This trait of coordination is referred to as the Across-the-Board Constraint. [12] For example:
There are other apparent exceptions to the Coordinate Structure Constraint and the Across-the-Board generalization, and their integration to existing syntactic theory has been a long-standing disciplinary desideratum. [13]
In pseudo-coordinative constructions, the coordinator, generally and, appears to have a subordinating function. It occurs in many languages and is sometimes known as "hendiadys", and it is often, but not always, used to convey a pejorative or idiomatic connotation. [14] Among the Germanic languages, pseudo-coordination occurs in English, Afrikaans, Norwegian, Danish and Swedish. [15] Pseudo-coordination appears to be absent in Dutch and German. The pseudo-coordinative construction is limited to a few verbs. In English, these verbs are typically go, try, and sit. In other languages, typical pseudo-coordinative verbs and/or hendiadys predicates are egressive verbs (e.g. go) and verbs of body posture (e.g. sit, stand and lie down).
A typical property of pseudo-coordinative constructions is that, unlike ordinary coordination, they appear to violate the Across-the-Board extraction property (see above). In other words, it is possible to extract from one of the conjuncts. [16]
It has been argued that pseudo-coordination is not a unitary phenomenon. Even in a single language such as English, the predicate try exhibits different pseudo-coordination properties to other predicates and other predicates such as go and sit can instantiate a number of different pseudo-coordinative construction types. [17] On the other hand, it has been argued that at least some different types of pseudo-coordination can be analyzed using ordinary coordination as opposed to stipulating that pseudo-coordinative and is a subordinator; the differences between the various constructions derive from the level of structure that is coordinated e.g. coordination of heads, coordination of VP, etc.
In Japanese, the particle と to, which can be translated as and in English, is used as a coordinator of nominals (a noun, noun phrase or any word that functions as a noun). It cannot be used to coordinate other word categories such as adjectives and verbs. Different word categories require different coordinators. We will discuss the basic use of these coordinators in Japanese. [18] Below is a simple example of nominal coordination in Japanese.
メアリー
Mary
Mary
-は
-wa
-TOP
[りんご-と
[ringo-to
[apple-and
バナナ]
banana]
banana]
-を
-o
-ACC
買った
katta
bought
Mary bought apples and bananas.
To can also be used to coordinate two conjuncts that are not syntactic constituents. In the example below, the conjuncts each include an indirect object, a direct object, and a quantifier. [19]
{{fs interlinear|lang=ja|number=(2) |メアリー -が {[[トム-に} りんご-を 二-つ]-と [ボブ-に バナナ-を 三-本]] あげた |Mary -ga {[[Tom-ni} ringo-o futa-tsu]-to [Bob-ni banana-o san-bon]] ageta |Mary -NOM {[[Tom-to} apple-ACC two-CL]-and [Bob-to banana-ACC three-CL]] gave |Mary gave two apples to Tom and three bananas to Bob.}}
There are two classes of adjectives in Japanese: i-adjectives and na-adjectives. The -te suffix will change because of the classes of the adjectives.
Normal form | -Te form | |
---|---|---|
i-adjectives | 安い yasui | 安くて yasukute |
na-adjectives | 安全な anzenna | 安全で anzende |
When i-adjectives are in -te form, the final い -i is dropped and くて -kute is added as a suffix instead. On the contrary, when na-adjectives are in -te form, the final な -na is dropped and で -de is added as a suffix.
As we can see, instead of a particle, a suffix is added to the first adjective to show coordination of adjectives. Below is a simple example of adjectival coordination in Japanese. In (3), both adjectives are i-adjectives, while in (4) both adjectives are na-adjectives.
ラーメン
ramen
ramen
-は
-wa
-TOP
[安-くて
[yasu-kute
[cheap-and
美味しい]
oishii]
tasty]
Ramen is cheap and tasty.
この
kono
this
道
michi
road
-は
-wa
-TOP
[安全-で
[anzen-de
[safe-and
綺麗だ]
kirei da]
beautiful]
This road is safe and beautiful.
There are three classes of verbs in Japanese: ru-verbs, u-verbs and irregular verbs. Similar to Japanese adjectives, the -te suffix will change because of the class of the verbs. The te-form of verbs is a lot more complicated than that of adjectives, for the purpose of this Wikipedia page, we will just discuss the coordinator how it's used in Japanese. [18]
メアリー
Mary
Mary
-は
-wa
-TOP
[食べ-て
[tabe-te
[ate-and
飲んだ]
nonda]
drank]
Mary ate and drank.
In Hausa, dà means and in English, while kóo means or. It is used as a coordinator for nominals. Unlike Japanese, articles dà and kóo can be used to coordinate other word categories like adjectives and nominalised verbs. [20] The number of nouns that can be conjoined to dà is unlimited. [21] The tables below shows a simple example of simple nominal coordination in Hausa. [20]
Àbêokùtá
Abeokuta
dà/kóo
and/or
Àbúuja
Abuja
dà
and
Ilòor̃í
Ilorin
dà/kóo
and/or
Ìbàadàn
Ibadan
Abeokuta and/or Abuja and Ilorin and/or Ibadan
Wánnàn
This
rìigáa
dress
tánàà
3SG.F.PROG
dà
with
kálàa
colour
jáa
red
dà/kóo
and/or
kóor̃èe
green
This dress has red and green colour
Cîn
Eating
náamà-n
meat-of
àládèe
pig
dà
and
shân
drinking
gíyàa
beer
Eating and drinking beer
VP sentences are coordinated asyndetically. The table below show examples of this. [20]
Hàbîb
Habib
yáa
3SG.M.PFV
háu
climb
Mount Patti
Mount Patti
(*dà/kóo)
and/or
yáa
3SG.M.PFV
núunàa
show
mánà
us
kòogi-n
river-GEN
Íísà
Niger
(*dà/kóo)
and/or
yáa
3SG.M.PFV
gyáarà
repair
móotà
car
-r-
-GEN-
sà
his
Habib has climbed Mount Patti, has showed use the river Niger, has repaired his car
Kóo can also only appear between the first and second, or the second and third conjunct. The tables below show examples of this.
Kóo
Either
Hàbîb
Habib
yáa
3SG.F.PROG.
tàfí
travel
Lákwájà
Lokajal
kóo
or
yáa
3SG.F.PROG.
tàfí
travel
Sákkwátó
Sokoto
Either Habib went to Lokoja or he went to Sokoto
Hàbîb
Habib
yá
3SG.M.PFV.SBJV.
háu
climb
Mount Patti
Mount Patti
kóo
or
yáa
3SG.M.PFV.
núunàa
show
mánà
us
kòogi-n
river-GEN
Íísà
Niger
kóo
or
yáa
3SG.M.PFV
gyáarà
repair
móotà-r-sà
car-GEN-his
Habib climbed Mount Patti either to show us river Niger or to repair his car.
Standard Mandarin Chinese allows floating coordinators. Essentially, these consist of coordinators in the language that cannot appear to the left of or inside the first conjunct. Instead, they may only appear between two conjuncts or inside the second. [22] This is demonstrated in the following table in which the floating coordinator ke(shi) may occur between the two conjuncts in the first example or inside the second conjunct in the second example. However, when ke(shi) appears inside the first conjunct, as in the third example, or to the left of the first conjunct, as in the fourth example, the sentence becomes ungrammatical.
Baoyu Baoyu yao want tiaowu, dance ke(shi) but wo I yao want hui- return- jia home Baoyu wants to dance but I want to return home |
Baoyu Baoyu yao want tiaowu, dance wo I ke(shi) but yao want hui- return- jia home Baoyu wants to dance but I want to return home |
*Baoyu *Baoyu ke(shi) but yao want tiaowu, dance wo I yao want hui- return- jia home |
*Ke(shi) *but Baoyu Baoyu yao want tiaowu, dance wo I yao want hui- return- jia home |
The distribution of the coordinator yu(shi), meaning and thus, bears some similarity to that of ke(shi) but restricts other coordinators from appearing before the conjunct in which it occurs. Yu(shi) may precede or follow the second conjunct but never precedes the first conjunct. [22]
Baoyu Baoyu yi once guli encourage yushi and Daiyu Daiyu huifu recover -le -PRF zixin confidence Baoyu encouraged her, and thus Daiyu recovered her confidence |
Baoyu Baoyu yi once guli, encourage Daiyu Diayu yushi and huifu recover -le -PRF zixin confidence Baoyu encouraged her, and thus Daiyu recovered her confidence |
(*yushi) and Baoyu Baoyu (*yushi) and yi one guli, encourage Daiyu Daiyu huifu recover -le -PRF zixin confidence |
Standard Mandarin Chinese also follows the Lexical Integrity Hypothesis, which has an effect on syntactic coordination in the language. The second example shown below (marked with an asterisk) is ungrammatical because, as correctly predicted by the hypothesis, syntactic transformations are not applicable to word-internal structures. Thus, the second example shown below is not allowed and is thus marked with an asterisk. [23]
Lisi Lisi shi AUX yi one ge CL [lu-shi]NP law-teacher jian and [yi-shi]NP heal-teacher Lisi is a lawyer and doctor |
*Lisi shi yi ge [lu-jian-yi]-shi]N *Lisi AUX one CL law-and-heal-teacher |
However, it is important to note that Verb-Object compounds are an exception to this hypothesis. This is demonstrated in the following example in which the V-O forms chi-hun and chi-su permit the coordination of the word-internal elements hun and su, thereby not following the hypothesis.
Zhangsan Zhangsan shi AUX -bu- -no- shi AUX chi- eat- hun- meat- han- and- su veggies dou all keyi? allowed? Is it that Zhangsan can eat non-vegetarian or vegetarian meals? |
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: CS1 maint: multiple names: authors list (link)In linguistics, syntax is the study of how words and morphemes combine to form larger units such as phrases and sentences. Central concerns of syntax include word order, grammatical relations, hierarchical sentence structure (constituency), agreement, the nature of crosslinguistic variation, and the relationship between form and meaning (semantics). There are numerous approaches to syntax that differ in their central assumptions and goals.
In grammar, the comitative case is a grammatical case that denotes accompaniment. In English, the preposition "with", in the sense of "in company with" or "together with", plays a substantially similar role.
In grammar, a phrase—called expression in some contexts—is a group of words or singular word acting as a grammatical unit. For instance, the English expression "the very happy squirrel" is a noun phrase which contains the adjective phrase "very happy". Phrases can consist of a single word or a complete sentence. In theoretical linguistics, phrases are often analyzed as units of syntactic structure such as a constituent.
In general linguistics, the comparative is a syntactic construction that serves to express a comparison between two entities or groups of entities in quality or degree - see also comparison (grammar) for an overview of comparison, as well as positive and superlative degrees of comparison.
In generative grammar, a parasitic gap is a construction in which one gap appears to be dependent on another gap. Thus, the one gap can appear only by virtue of the appearance of the other gap, hence the former is said to be "parasitic" on the latter. For example, in the example sentence in (1) the first gap is represented by an underscore, and appears as a result of movement of the constituent which explanation to the beginning of the sentence. The second gap is represented by an underscore with a subscript p ( __p); this is the "parasitic gap".
A cleft sentence is a complex sentence that has a meaning that could be expressed by a simple sentence. Clefts typically put a particular constituent into focus. In spoken language, this focusing is often accompanied by a special intonation.
In syntactic analysis, a constituent is a word or a group of words that function as a single unit within a hierarchical structure. The constituent structure of sentences is identified using tests for constituents. These tests apply to a portion of a sentence, and the results provide evidence about the constituent structure of the sentence. Many constituents are phrases. A phrase is a sequence of one or more words built around a head lexical item and working as a unit within a sentence. A word sequence is shown to be a phrase/constituent if it exhibits one or more of the behaviors discussed below. The analysis of constituent structure is associated mainly with phrase structure grammars, although dependency grammars also allow sentence structure to be broken down into constituent parts.
In linguistics, wh-movement is the formation of syntactic dependencies involving interrogative words. An example in English is the dependency formed between what and the object position of doing in "What are you doing?" Interrogative forms are sometimes known within English linguistics as wh-words, such as what, when, where, who, and why, but also include other interrogative words, such as how. This dependency has been used as a diagnostic tool in syntactic studies as it can be observed to interact with other grammatical constraints.
In linguistics, an adverbial phrase ("AdvP") is a multi-word expression operating adverbially: its syntactic function is to modify other expressions, including verbs, adjectives, adverbs, adverbials, and sentences. Adverbial phrases can be divided into two types: complement adverbs and modifier adverbs. For example, in the sentence She sang very well, the expression very well is an adverbial phrase, as it modifies the verb to sing. More specifically, the adverbial phrase very well contains two adverbs, very and well: while well modifies the verb to convey information about the manner of singing, very is a degree modifier that conveys information about the degree to which the action of singing well was accomplished.
In theoretical linguistics, a distinction is made between endocentric and exocentric constructions. A grammatical construction is said to be endocentric if it fulfils the same linguistic function as one of its parts, and exocentric if it does not. The distinction reaches back at least to Bloomfield's work of the 1930s, who based it on terms by Pāṇini and Patañjali in Sanskrit grammar. Such a distinction is possible only in phrase structure grammars, since in dependency grammars all constructions are necessarily endocentric.
In linguistics, a complementizer or complementiser is a functional category that includes those words that can be used to turn a clause into the subject or object of a sentence. For example, the word that may be called a complementizer in English sentences like Mary believes that it is raining. The concept of complementizers is specific to certain modern grammatical theories. In traditional grammar, such words are normally considered conjunctions. The standard abbreviation for complementizer is C.
In linguistic typology, a verb–object–subject or verb–object–agent language, which is commonly abbreviated VOS or VOA, is one in which most sentences arrange their elements in that order. That would be the equivalent in English to "Drank cocktail Sam." The relatively rare default word order accounts for only 3% of the world's languages. It is the fourth-most common default word order among the world's languages out of the six. It is a more common default permutation than OVS and OSV but is significantly rarer than SOV, SVO, and VSO. Families in which all or many of their languages are VOS include the following:
Araki is a nearly extinct language spoken in the small island of Araki, south of Espiritu Santo Island in Vanuatu. Araki is gradually being replaced by Tangoa, a language from a neighbouring island.
In linguistics, subordination is a principle of the hierarchical organization of linguistic units. While the principle is applicable in semantics, morphology, and phonology, most work in linguistics employs the term "subordination" in the context of syntax, and that is the context in which it is considered here. The syntactic units of sentences are often either subordinate or coordinate to each other. Hence an understanding of subordination is promoted by an understanding of coordination, and vice versa.
Scrambling is a syntactic phenomenon wherein sentences can be formulated using a variety of different word orders without any change in meaning. Scrambling often results in a discontinuity since the scrambled expression can end up at a distance from its head. Scrambling does not occur in English, but it is frequent in languages with freer word order, such as German, Russian, Persian and Turkic languages. The term was coined by Haj Ross in his 1967 dissertation and is widely used in present work, particularly with the generative tradition.
In linguistics, gapping is a type of ellipsis that occurs in the non-initial conjuncts of coordinate structures. Gapping usually elides minimally a finite verb and further any non-finite verbs that are present. This material is "gapped" from the non-initial conjuncts of a coordinate structure. Gapping exists in many languages, but by no means in all of them, and gapping has been studied extensively and is therefore one of the more understood ellipsis mechanisms. Stripping is viewed as a particular manifestation of the gapping mechanism where just one remnant appears in the gapped/stripped conjunct.
The lexical integrity hypothesis (LIH) or lexical integrity principle is a hypothesis in linguistics which states that syntactic transformations do not apply to subparts of words. It functions as a constraint on transformational grammar.
Stripping or bare argument ellipsis is an ellipsis mechanism that elides everything from a clause except one constituent. It occurs exclusively in the non-initial conjuncts of coordinate structures. One prominent analysis of stripping sees it as a particular manifestation of the gapping mechanism, the difference between stripping and gapping lies merely with the number of remnants left behind by ellipsis: gapping leaves two constituents behind, whereas stripping leaves just one. Stripping occurs in many languages and is a frequent occurrence in colloquial conversation. As with many other ellipsis mechanisms, stripping challenges theories of syntax in part because the elided material often fails to qualify as a constituent in a straightforward manner.
This article describes the syntax of clauses in the English language, chiefly in Modern English. A clause is often said to be the smallest grammatical unit that can express a complete proposition. But this semantic idea of a clause leaves out much of English clause syntax. For example, clauses can be questions, but questions are not propositions. A syntactic description of an English clause is that it is a subject and a verb. But this too fails, as a clause need not have a subject, as with the imperative, and, in many theories, an English clause may be verbless. The idea of what qualifies varies between theories and has changed over time.
In linguistics, the term right node raising (RNR) denotes a sharing mechanism that sees the material to the immediate right of parallel structures being in some sense "shared" by those parallel structures, e.g. [Sam likes] but [Fred dislikes] the debates. The parallel structures of RNR are typically the conjuncts of a coordinate structure, although the phenomenon is not limited to coordination, since it can also appear with parallel structures that do not involve coordination. The term right node raising itself is due to Postal (1974). Postal assumed that the parallel structures are complete clauses below the surface. The shared constituent was then raised rightward out of each conjunct of the coordinate structure and attached as a single constituent to the structure above the level of the conjuncts, hence "right node raising" was occurring in a literal sense. While the term right node raising survives, the actual analysis that Postal proposed is not widely accepted. RNR occurs in many languages, including English and related languages.