Suggested Answers for Check Questions

There are theoretically two alternatives: either it is the morphemes ‑s and ‑ed, ‑ing and ‑en that move (lower onto the verb) or the verb moves up. It is assumed that English verbal stems cannot host more than one bound morpheme, hence in a clause that contains aspectuals (which head their own vP), the thematic V moves and picks up the lower bound morpheme but as it is unable to host more, an aspectual (be or have or even both if need be) are inserted to pick up the aspectual morphemes.