(By David Gil): "In English, nouns may be modified in a variety of ways, some of which are illustrated in the following example: (1a) John's apple, (1b) red apple, (1c) apple that John bought.❡
In (1) above, all three NPs consist of a head noun apple plus an attributive expression; however, the attributive expression is of a different semantic type in each example: in (1a) it denotes an alienable possessor John's, in (1b) a colour property red, and in (1c) an activity that John bought with respect to which the head noun has the role of patient.❡
In English, as evident in (1), these three semantic functions are coded by means of three different morphosyntactic constructions: in (1a) the attributive expression precedes the head and is marked with the possessive enclitic 's, in (1b) the attributive expression precedes the head but is unmarked, and in (1c) the attributive expression follows the head and is marked with the complementizer that. Based on paradigms such as the above in English and in other languages, grammarians distinguish between three different types of constructions, genitives, adjectives and relative clauses, of which the above are typical examples."