Adjuncts Adjuncts are head modifiers which may be added infinitely. The adjunct phrase is an X' node which contains an X' node. This allows for infinite recursivity , which distinguishes adjuncts from specifiers and complements. The universal phrase structure of XP is realized differently depending upon whether the head is an N, V, A or P, and depending on the restrictions of a given language. The following table lists all the possibilities of NPs, VPs and APs, showing how they relate to XP in English.
All phrases comprise a head with optional specifiers, complements, and recursive adjuncts.