Phrases

In grammar, a phrase is a group of words functioning as a single unit in the syntax of a sentence.

For example, the store at the end of the street is a phrase. It acts like a noun. It can further be broken down into two shorter phrases functioning as adjectives: at the end and of the street, a shorter prepositional phrase within the longer prepositional phrase. At the end of the street could be replaced by an adjective such as nearby: the nearby house or even the house nearby. The end of the street could also be replaced by another noun, such as the crossroads to produce the house at the crossroads.

Most phrases have a central word defining the type of phrase. This word is called the head of the phrase. Some phrases, however, can be headless. For example, the rich is a noun phrase composed of a determiner and an adjective without a noun.

Types of phrases
Phrases may be classified by the type of head taken by them:


 * Prepositional phrase (PP) with a preposition as head (e.g. in love, over the rainbow). Languages using postpositions instead have postpositional phrases. The two types are sometimes commonly referred to as adpositional phrases.
 * Noun phrase (NP) with a noun as head (e.g. the black cat, a cat on the mat)
 * Verb phrase (VP) with a verb as head (e.g. eat cheese, jump up and down)
 * Adjectival phrase (AP) with an adjective as head (e.g. full of toys, fraught with guilt)
 * Adverbial phrase (AdvP) with an adverb as head (e.g. very carefully)

Formal definition
A phrase is a syntactic structure having syntactic properties derived from its head.

Complexity
A complex phrase consists of several words, whereas a simple phrase consists of only one word. This terminology is especially often used with verb phrases:
 * simple past and present are simple phrases, which require just one verb
 * complex verbs have one or two aspects added and hence require additional two or three words

"Complex," which is phrase-level, is often confused with "compound," which is word-level. However, there are certain phenomena that formally seem to be phrases but semantically are more like compounds, such as "women's magazines," which has the form of a possessive noun phrase, but which refers (just like a compound) to one specific lexeme (i.e. a magazine for women and not a magazine owned by a woman).

Semiotic approaches to the concept of "phrase"
In more semiotic approaches to language, such as the more cognitivist versions of construction grammar, a phrasal structure is not only a certain formal combination of word types whose features are inherited from the head. Here each phrasal structure also expresses some type of conceptual content, be it specific or abstract.