7.9 省to 的动词不定式 | ||
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。 举例: He wants to move to France and marry the girl. He wants to do nothing but go out. 比较: He wants to do nothing but go out. He wants to believe anything but to take the medicine. 典型例题 1) ---- I usually go there by train. ---- Why not ___ by boat for a change? A. to try going B. trying to go C. to try and go D. try going 答案:D. why not 后面接不带to 的不定式,因此选D。 2) Paul doesn't have to be made ___. He always works hard. A. learn B. to learn C. learned D. learning 答案:B. make后接不带to 的动词不定式,当其用于被动时,to 不可省略。 |