小学教育网 发表于 2018-8-27 23:53:23

小学英语语法备考指南:用作介词的to

小学英语语法备考指南:用作介词的to
          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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