S|Simple declarative clause, i.e. one that is not introduced by a (possibly empty) subordinating conjunction or wh-word and that does not exhibit subject-verb inversion. (Santorini 1991) Simple declarative sentences: (S (NP-SBJ Casey) (VP threw (NP the ball))) ... S â ´ Simple declarative clause, i.e. one that is not introduced by a (possibly empty) subordinating conjunction or wh-word and that does not exhibit subject-verb inversion. (Bies et al. 1995)