不定式的语态
当不定式的逻辑主语是其动作的承受者时,就用被动式。如:
He was seen to enter the hall.
He asked to be sent to work in Tibet.
省to 的动词不定式
情态动词(除ought 外,ought to)
Would rather, had better.
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 him dance.
He was seen to dance.
The boss made them work the whole night.
They were made to work the whole night.
使役动词 let, have, make.
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.
Help 可带 to ,也可不带to, help sb. (to) do sth.
Why…/Why not…
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.
通常在discover, imagine, suppose, think, understand 等词后,可以省去 to be .如:
He is supposed (to be) nice.
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