ⅠⅠ .作主语.作主语1) 不定式作主语, 谓语动词常用单数。2 )不定式(短语)作主语时, 为避免句子头重脚轻,常用 it 作形式主语置于句首,而将不定式(短语)放在句尾。 1 . When and where to build the new factory ____ yet . (MET’91)A . is not decided B. are not decided C.has not decided D. have not decided2 . Is ____ necessary to complete the design before National Day(MET’89)A﹖. this B. that C . itD. heⅡ .作宾语1 )及物动词 ask, agree, beg, care, choose, decide, expect, force, fail, hope, learn, long, manage, offer, pretend, plan, prepare, promise, refuse, want, help, wish 等后接不定式作宾语。2 )要注意 can’t help, try, remembercan’t help, try, remember ,, forgeforget, mean, regret, stopt, mean, regret, stop 等动词后接不定式与接v-ing 的区别。3 . She can’t help __ the house because she’s busy making a cake . ( 上海’ 99)A.to cleanB.cleaningC.cleaned D.being cleaned4 . He agreed ____ here but so far he hasn’t turned up yet . (NMET’95)A . having met B. meeting C . to meet D. to have met5 . -You were brave enough to raise objections at the meeting . -Well, now I regret ____ that . (NMET’95 A . to do B. to be done C . to have done D. having done Ⅲ .作宾语补足语和主语补足语动词不定式作补语的考点集中在作补语的动词不定式带to 还是不带 to 上。1) 能以带 to 的不定式作宾补的动词有 ask, allow, warn, get, tell, invite, force, oblige, beg, wish, want, like, expect, encourage, advise, persuade, permit, request, order, cause, know, call on 等。2) 用不带 to 的不定式作宾补的动词有 see, hear, watch, see, hear, watch, notice, observe, listen to, look at, feel, manotice, observe, listen to, look at, feel, mak...