1- Theo sau tất cả các trợ từ (động từ khiếm khuyết):
can, could, will,shall, would, may, might, ought to, must, had better, would like to, needn't, would rather, would sooner, be supposed to là những động từ không "chia", V-bare.
2- Những động từ theo sau là "to verb" có 2 trường hợp:
2.a- [công thức: S+V+to V]:
afford, appear, ask, bear, begin, choose, decide, expect, forget, hate, hesitate, intend, like, manage, neglect, prefer, pretend, propose, regret, seem, swear, try, wish, agree, arrange, attempt, beg, care, consent, determine, fail, happend, help, hope, learn, love, mean, offer, prepare, promise, refuse, remember, start, trouble, want, would like prefer.
2.b- [công thức: S+V+O+to V]:
advise, ask, be, command, encourage, forbid, get, help, intend, leave, mean, oblige, permit, prefer, recommend, remind, tell, allow, bear, cause, compel, expect, force, hate, instruct, invite, like, need, order, persuade, press, request, teach, tempt, trouble, warn, want, wish.