This document discusses syntactic categories and constituent structure. It defines common parts of speech like nouns, verbs, adjectives. It notes that nouns can denote activities, events, states and properties, not just people, places and things. Morphology and distribution provide more reliable evidence for categories than semantics alone. The document then discusses analyzing sentences into constituents like NP and V NP. It provides tests for constituents like proform replacement and question tests. Finally it discusses noun phrase functions like subject, direct object, and predicative complement.