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大学英语四级语法知识:省to 的动词不定式
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  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。

 

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