cannot help doing sth.There is no use doing sth.
不定式
1.单个不定式结构作主语,谓语用单数的形式,但是并列的不定式结构作主语时,谓语应该用复数,如:
To go to schoolis his dream.上学是他的梦想。
To go to school and to stay away from his cruel fatherale were what he expected-他期望能去上学,远离他残忍的父亲。
2.跟在名词后面作定语,如:
the ability to operate the machine操作机器的能力the firstpeople to speak第一个发育的人
3.跟在be动词的后面作表语,如:
What 1 want to do is to have a sightseeingaround Be.jing.我想做的是在北京观光旅行。
4.跟在及物动词的后面作其宾语
I enjoy talking to you.能和你谈话我真高兴。
They dont permit smokingin the public places.他们不允许在公众场合吸烟。
5.对宾语的性质,特征等进行补充说明,作宾语补足语,如:
We have persuaded him to accept our proposal.一我们已经说服他接受了我们的建议。
在使役动词和感官动词的后面常带不to的不定式结构作宾语补足语:
havesb.do sthhelp sb.do sth.
6.作状语。不定式结构在句子中通常充当结果状语和目的状语。如:
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