不定式的构成非常简单,告诉我是什么?对!是to+动词原形。当然啦,to有时也可以不带。动词不定式没有人称和数的变化,可以担当除谓语外的任何句子成分。那什么时候 可以不带to呢?
不定式省to有四种情况:
使役动词 let,have,make 等后接不定式。如:Let him go! 让他走!
would rather,had better后。如:You had better stay at home.你最好呆在家里。
Why... / why not...后。如:Why not have a good rest on Sunday?为什么星期天不好好休息一下呢?
感官动词 see, watch, look at, hear, listen to, smell,feel, find 等后作宾补,省to。如:I saw him dance. 我看见他跳舞。注意:这些情况在被动句中可千万不可省to哟! 如:The boss made them work the whole night.变成被动句:They were made to work the whole night.
不定式的特殊用法:
It与不定式:动词不定式可以做主语,但如果动词不定式太长,显得头重脚轻的,那么我们就可用形式主语it代替,而把真正主语(即不定式)放于句尾。
如: It is not difficult for me to study English well.(对我来说学好英语是可能的。)不定式还可以充当句子的宾语,但有些动词,如find,think,believe 等,这样的不定式可继续充当其宾语的作用。如: I found it difficult to fall asleep.我发现很难入睡。
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