三、省to 的动词不定式
1、情态动词(除ought 外,ought to)
2、Would rather, had better.

3、 感官动词 see, watch, look at, notice, observe, hear, listen to, smell, feel 等后作宾补,省略 to.注意:在被动语态中 to 不能省略掉。如:I saw h专升本的条件im dance.He was seen to dance.The boss made them work the whole night.They were made to work the whole night.
4、使役动词 let, have, make.
5、由 and, or 和 than 连接的两个不定式,第二个 to 可以省去。如:He wants to move to France and marry the girl.
6、Help 可带 to ,也可不带to, help sb. (to) do sth.
7、Why…/Why not…
8、But 和 except 前是动词 do 时,后面出现的动词用不带 to 的动词不定式。试比较: He wants to do nothing but go out.He wants to believe anything but to take the medicine.
9、通常在discover, imagine, suppose, think, understand 等词后,可以省去 to be .如:He is supposed (to be) nice. 他应该是个好人。
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