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it作形式主语和宾语

A形式主语

⑴It’s +adj. +for/of +sb. to do sth.

It’s very kind of you

It’s important for you to learn English well.

⑵It’s time for sb.to do sth.

It’s time for you to sing

⑶It seems that .....It seems that you are right.

⑷It’s one’s turn /job/duty to do sth.

It’s your turn/job/duty to clean the desk.

⑸It’s +adj. that 从句It’s necessary/certain/natural that he wiil win.

⑹It’s no use /good doing sth.做某事没有用处/好处。

It’s no use /good eating too much

⑺It’s +一段时间since +一般过去时态从句或It has been +some time +since +一般过去时态从句It’s(been) five years since we saw last .

⑻It’s a pity that ......It’s a pity that only six pieces of music in total were recorded for the future world to hear.

⑼It is said that/It is consider that/It is believed that ......It is said that he became a famous pianist.

B形式宾语

动词(feel，think，make,believe,consider,suppose等)+it +adj./n.+ to do sth.

I think it necessary to learn English well.

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