一:只接动名词(v-ing)作宾语的动词及固定结构:advise, appreciate, enjoy, delay, escape, finish, keep, imagine, mind, practise, risk, suggest, excuse, miss, avoid, complete, permit, prove等。Put off, spend some time in, keep(on), feel like, be busy, give off, be worth, be used to, can’t help, waste time(in), have difficulty in, what/how about, have a good time in, look forward to, devote to, pay attention to, stick to, insist on.
二:只接不定式(to do)的动词,如:afford,agree,claim,choose,decide,demand,desire,determine,be determined,fail,hope,manage,offer,plan,prepare,pretend,promise,refuse,seek,resolve(决心),threaten,wish,arrange,undertake(答应),volunteer (志愿),learn,etc.
三:带省to 的动词不定式(即动词原形)
1) 情态动词 ( 除ought 外,ought to): 2) 使役动词 let, have, make: 3) 感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作宾补,省略to。 注意:在被动语态中则to 不能省掉。 I saw him dance. =He was seen to dance. The boss made them work the whole night. =They were made to work the whole night. 4) would rather,had better: 5) Why… / why not…: 6) help 可带to,也可不带to, help sb (to) do sth: 7) but和except:but前是动词do时,后面出现的动词用不带to的动词不定式。 8) 由and, or和than连接的两个不定式,第二个to 可以省去: 9) 通常在discover, imagine, suppose, think, understand等词后,可以省去to be: He is supposed (to be) nice. 他应该是个好人。
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