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。 |