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小学英语语法—用作介词的to

时间: 04-07     手机版

  用作介词的to

  to 有两种用法:一为不定式+动词原形; 一为介词+名词/动名词, to 在下面的用法中是第二种,即to+ 名词/动名词:admit to承认,confess to承认,be accustomed to 习惯于,be used to 习惯于,stick to 坚持,turn to开始,着手于,devote oneself to 献身于,be devoted to 致力于, look forward to 盼望,pay attention to

  注意

  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。

 

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