to be: am, is, areto have: have, has, hadto give: give, gives, gaveto apply: apply, applies, appliedto satisfy: satisfy, satisfies, satisfiedto live: live, lives, livedto study: study, studies, studiedto examine: examine, examines, examinedto solve: solve, solves, solvedto leave: leave, leaves, leftto survive: survive, survives, survivedto experience: experience, experiences, experiencedto provide: provide, provides, providedto turn: turn, turns, turnedto observe: observe, observes, observedto feed: feed, feeds, fedto build: build, builds, builtto depend: depend, depends, dependedto guarantee: guarantee, guarantees, guaranteed