Word-level categories
Traditional and non-traditional classification Major lexical categories: N, V, Adj, Prep.
(serving as heads: NP, VP, AP, PP.) Minor Lexical categories: Det, Deg, Qual, Aux,
PP (Deg) + P + (NP)……on the shelf, in the boat, quite near the station.
( ): optional; ……:other options
The XP rule
XP
Specifier
X
Complement
Head
Note: abstraction of all phrases: The phrase structure rules can be summed up as XP rule shown in the diagram, in which X, as a variable, stands for N, V, A or P.
the categories must be of the same type;
the category type of the coordinate phrase is identical to the category type the elements being conjoined.
Categories
Category refers to a group of linguistic items which fulfill the same or similar functions in a particular language such as a sentence, a noun phrase or a verb. The most central categories to the syntactic study are the word-level categories (traditionally, parts of speech/word class.)