Clause Types

Declarative clauses
 - unmarked order of the functional categories
 - Subject + Predicator + (IO) + (DO) + (Adjunct)

Interrogative clauses
 - yes/no interrogatives
 - open(wh-) interrogatives
 - alternative interrogatives

Imperative clauses
 - typically no S, based form of V

Exclamative clauses
 - what + determinative + ...
 - How + AP + ...