不定式作主语与V-ing形式作主语的不同:前者作主语时,常表示某一次体的动作;而后者常表示习惯性的动作。To teach the three children is my job this afternoon. 教这三个孩子是今天下午我的工作。
alking is a good form of exercise. 散步是锻炼的一种好方
动词不定式作主语时,常用it 作形式主语,而真正的主语动词不定式后置。
常用的句型有:
1. It is + adj.+ of /for sb to do sth
eg: It is not safe to drink the polluted water.
It is kind of him to help. ( He is kind.)
It is impossible for him to help us. ( He is impossible. x)
2. It is a/ an +n (crime, mistake, pity,
shame, good idea) + to do sth
eg: It's a good idea to visit the science museum this weekend.
3._________________ ____________________
eg:
It would take years to rebuild the castle
高考链接
1. Is ________ necessary to complete the design before National Day?
A. this B. that C. it D. he
2. It was foolish ________ you to give up what you rightly owned. A. for B. of C. about D. From
不定式及其短语作定语_____________________,
以下名词和句型常用不定式作定语,如: chance, way, opportunity, time, the first, the last, the second, the only等词后,在have to do和there be句型中。e.g.
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