一、出现以下词，用 do填空：
can, could, may, must, need, had better, why not, make, have to, let's, see, hear, watch, notice, Will( Would) you please…?
二、出现以下词，用 to do填空：
would like, want, begin, start, hope, decide, ask, wish, have something to do, tell, take time, it's time, remember, forget, learn, teach, try, stop, plan, adj./疑问词后， take, allow, encourage, warn, It's+形容词＋ to do something, discuss, know, refuse, invite, get order, like, offer, lend, make up one's mind to do, set one's mind to do, enough, need
三、出现以下词，用 doing填空：
finish, like, enjoy, mind, keep, be busy, there be, do some…, go doing, prevent, be worth, spend, practice, feel like, thank somebody for doing something, stop, excuse somebody for doing something, can't help, prefer… to…, look forward to… hate, mention, have fun doing,介词： at, in, on, of, from, for, about, with, without,, make a contribution to, be used to, hear, see, watch, notice, listen,
四、基数词的特殊变化
one - - - first; two - - - second; three - - - third; five - - - fifth; eight - - - eighth; nine - - - ninth; twelve - - - twelfth; twenty - - - twentieth; twenty-one - - - twenty-first
