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In X-bar theory in linguistics, specifiers, head words, and complements together form phrases. Specifiers differ from complements because they are not sisters of the head, but rather sisters of the phrase formed by the head and the complement. In English, some example of specifiers are determiners such as the, no, some, every, and possessives such as John's and my mother's, which can precede noun phrases. Adverbial phrases can be preceded by degree words such as very, extremely, rather and quite.
These specifiers are so called because they further qualify the category of the head - in these examples nouns and adverbs - in the phrase.
In recent transformational grammar, the term specifier is not normally used to refer to a type of word or phrase, but rather to a structural position provided by X-bar theory or some derivative thereof. In this usage, a phrase (usually a full XP, though in bare phrase structure it could in theory be an intermediate category) is said to occupy the specifier (SpecXP for short) of a head X.
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