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.

3- Theo sau bởi "V-ing": admit, advise, allow, anticipate, appreciate, avoid, confess, consider, deny, delay, detest, dislike, enjoy, escape, excuse, face, fancy, finish, give up, imagine, invlolve, justify, keep on, leave off, mention, mind, miss, permit, postpone, quit, recommend, resent, resist, resume, risk, save, tolerate, suggest, recollect, stop, pardon, can't resist, can't stand, can't help, understand
ngoài ra theo sau: be worth, it is no use, there is no, it is no good cũng là V-ing
4- Những động từ theo sau gồm cả "to verb" và "V-ing":
advise, attempt, commence, begin, allow, cease, continue, dread, forget, hate, intend, leave, like, love, mean, permit, prefer, propose, regret, remember, start, study, try, can't bear, recommend, need, want, require.
Đa số những động từ trên khi theo sau là "to verb" hoặc "V-ing" sẽ có nghĩa khác nhau.