This document discusses the selection of words in English syntax. It outlines several principles of word selection:
1. Words must be selected based on both meaning and grammaticality. For example, verbs must be selected to construct a sentence.
2. There are different types of word selection requirements - unidirectional, bidirectional/mutual, and mutual prohibition. For example, adjectives require nouns but not vice versa.
3. Word forms are also selected based on syntactic context and agreement between constituents. For example, verbs are selected with the correct suffix based on subject agreement.
4. Word selection and word form selection share some terminology but differ in properties like directionality and basis of selection. For