If is an English preposition, as seen in If it's sunny tomorrow, (then) we'll have a picnic.
As a preposition, if normally takes a clausal complement (e.g., it's sunny tomorrow in if it's sunny tomorrow). That clause is, within the conditional construction, the condition (or protasis) on which the main clause (or apodosis) is contingent. [1] : 599–600, 738 In such cases, if can be paraphrased as "in case" or "contingent on the case that".
If it's sunny tomorrow is a preposition phrase, and within a conditional construction it functions as an adjunct.
Where if takes a noun phrase (NP) or adjective phrase (AdjP) complement, the construction is concessive rather than conditional: The ascent was exhilarating, if NP[a challenge]/AdjP[challenging]). [1] : 737–738
Traditional grammar books commonly treat if, often understood as a single word encompassing both this preposition and the homonymous subordinator, as a "subordinating conjunction", a category covering a broad range of clause-connecting words. [1] : 599–600, 738, 1011–1014
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. There is a difference between the common use of the term phrase and its technical use in linguistics. In common usage, a phrase is usually a group of words with some special idiomatic meaning or other significance, such as "all rights reserved", "economical with the truth", "kick the bucket", and the like. It may be a euphemism, a saying or proverb, a fixed expression, a figure of speech, etc.. In linguistics, these are known as phrasemes.
English grammar is the set of structural rules of the English language. This includes the structure of words, phrases, clauses, sentences, and whole texts.
A noun phrase – or NP or nominal (phrase) – is a phrase that usually has a noun or pronoun as its head, and has the same grammatical functions as a noun. Noun phrases are very common cross-linguistically, and they may be the most frequently occurring phrase type.
In grammar, a conjunction is a part of speech that connects words, phrases, or clauses that are called the conjuncts of the conjunctions. That definition may overlap with that of other parts of speech, and so what constitutes a "conjunction" must be defined for each language. In English, a given word may have several senses, and be either a preposition or a conjunction depending on the syntax of the sentence. For example, after is a preposition in "he left after the fight" but is a conjunction in "he left after they fought". In general, a conjunction is an invariable (non-inflected) grammatical particle that may or may not stand between the items conjoined.
Adpositions are a class of words used to express spatial or temporal relations or mark various semantic roles. The most common adpositions are prepositions and postpositions.
Relative clauses in the English language are formed principally by means of relative words. The basic relative pronouns are who, which, and that; who also has the derived forms whom and whose. Various grammatical rules and style guides determine which relative pronouns may be suitable in various situations, especially for formal settings. In some cases the relative pronoun may be omitted and merely implied.
In English, the passive voice is marked by a subject that is followed by a stative verb complemented by a past participle. For example:
The enemy was defeated. Caesar was stabbed.
In linguistics, head directionality is a proposed parameter that classifies languages according to whether they are head-initial or head-final. The head is the element that determines the category of a phrase: for example, in a verb phrase, the head is a verb. Therefore, head initial would be "VO" languages and head final would be "OV" languages.
In linguistics, a small clause consists of a subject and its predicate, but lacks an overt expression of tense. Small clauses have the semantic subject-predicate characteristics of a clause, and have some, but not all, properties of a constituent. Structural analyses of small clauses vary according to whether a flat or layered analysis is pursued. The small clause is related to the phenomena of raising-to-object, exceptional case-marking, accusativus cum infinitivo, and object control.
The Cambridge Grammar of the English Language (CamGEL) is a descriptive grammar of the English language. Its primary authors are Rodney Huddleston and Geoffrey K. Pullum. Huddleston was the only author to work on every chapter. It was published by Cambridge University Press in 2002 and has been cited more than 8,000 times.
English prepositions are words – such as of, in, on, at, from, etc. – that function as the head of a prepositional phrase, and most characteristically license a noun phrase object. Semantically, they most typically denote relations in space and time. Morphologically, they are usually simple and do not inflect. They form a closed lexical category.
The English pronouns form a relatively small category of words in Modern English whose primary semantic function is that of a pro-form for a noun phrase. Traditional grammars consider them to be a distinct part of speech, while most modern grammars see them as a subcategory of noun, contrasting with common and proper nouns. Still others see them as a subcategory of determiner. In this article, they are treated as a subtype of the noun category.
English adverbs are words such as so, just, how, well, also, very, even, only, really, and why that head adverb phrases, and whose most typical members function as modifiers in verb phrases and clauses, along with adjective and adverb phrases. The category is highly heterogeneous, but a large number of the very typical members are derived from adjectives + the suffix -ly and modify any word, phrase or clause other than a noun. Adverbs form an open lexical category in English. They do not typically license or function as complements in other phrases. Semantically, they are again highly various, denoting manner, degree, duration, frequency, domain, modality, and much more.
The syntax of the Welsh language has much in common with the syntax of other Insular Celtic languages. It is, for example, heavily right-branching, and the verb for be is crucial to constructing many different types of clauses. Any verb may be inflected for three tenses, and a range of additional tenses are constructed with auxiliary verbs and particles. Welsh lacks true subordinating conjunctions, and instead relies on special verb forms and preverbal particles to create subordinate clauses.
English nouns form the largest category of words in English, both in the number of different words and how often they are used in typical texts. The three main categories of English nouns are common nouns, proper nouns, and pronouns. A defining feature of English nouns is their ability to inflect for number, as through the plural –s morpheme. English nouns primarily function as the heads of noun phrases, which prototypically function at the clause level as subjects, objects, and predicative complements. These phrases are the only English phrases whose structure includes determinatives and predeterminatives, which add abstract-specifying meaning such as definiteness and proximity. Like nouns in general, English nouns typically denote physical objects, but they also denote actions, characteristics, relations in space, and just about anything at all. Taken all together, these features separate English nouns from other lexical categories such as adjectives and verbs.
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.
English adjectives form a large open category of words in English which, semantically, tend to denote properties such as size, colour, mood, quality, age, etc. with such members as other, big, new, good, different, Cuban, sure, important, and right. Adjectives head adjective phrases, and the most typical members function as modifiers in noun phrases. Most adjectives either inflect for grade or combine with more and most to form comparatives and superlatives. They are characteristically modifiable by very. A large number of the most typical members combine with the suffix -ly to form adverbs. Most adjectives function as complements in verb phrases, and some license complements of their own.
English subordinators are words that mostly mark clauses as subordinate. The subordinators form a closed lexical category in English and include whether; and, in some of their uses, if, that, for, arguably to, and marginally how.
English coordinators are conjunctions that connect words, phrases, or clauses with equal syntactic importance. The primary coordinators in English are and, but, or, and nor.
If is a subordinator similar to whether, marking the subordinate clause as interrogative.