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师梦圆初中英语教材同步人教版九年级全一册Section A Grammar focus 4a—4c下载详情
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动词不定式的结构

*

作主语

To hear your voice is so nice.

To study hard is very important.

It is so nice to hear your voice.

It is very important to study hard.

不定式作主语时,通常用it作形式主语,

把真正的主语放在后面。

注意:

1、It is +adj. for/ of sb. to do sth.

*

It +be + adj. +for/of sb. to do sth.

for: adj.多为描述不定式行为的特征 (important/ necessary / interesting 等.)

of: adj. 多为 描述人的品质特征 (kind / nice / friendly / wise / foolish 等.)

作主语

It is easy _______ her to learn English well.

It is clever ________ you to solve the problem.

of

for

*

2、It takes sb. some time to do sth.

It takes me three hours to finish the homework every day.

作主语

我每天花去三个小时完成家庭作业。

I spend three hours finishing the homework every day.

*

3、It is + n. (for sb) to do sth.

It is my pleasure to help you with your English.

作主语

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