时间：2022-10-19 02:20:31
it是中性的第三人称单数代词，其主格和宾格形式相同，在句中可充当主语、宾语和表语。还可做形式主语和宾语，来替代不定式、动词的ing和从句。
人称代词it的用法：
1）It一般指人以外的一切生物或事物。有时也指婴儿、小孩或不知性别的人。
- Where is your car？
你的车呢？
- It’s in the garage.
在车库里。
Look！ It’s going up that tree.
瞧！它正往树上爬呢。
Her baby is due next month. She hopes it will be a boy.
她的孩子该下个月出生。她希望会是个男孩。
Someone is ringing. Who might it be？
有人在按门铃，会是谁呢？
2）指已知或正在发生的事实或情况。
Yes， I was at home on Sunday. What about it？
是的，我星期天就在家，怎么了？
Stop it. You are hurting me.
住手。你弄疼我了。
If I can help it， I don’t like working late into the night.如果能行的话，我就不会熬到深夜了。
3） 指上下文内容
Professor Lee gave us a lecture yesterday. It was of great interest.
Professor Lee gave us a lecture yesterday， which was of great interest.
昨天李教授给我们做了一个报告，很有趣。
Yang Liwei was the first Chinese to be sent up into space. It made the Chinese proud.
Yang Liwei was the first Chinese to be sent up into space， which made the Chinese proud.
杨利伟是第一个被送入太空的中国人，这使得中国人非常自豪。
She runs the store very well and I know it.
She runs the store very well， which I know.
她把这家商店经营的很好，这我清楚。
非人称代词it的用法。
it用作无人称的主语，不指物，而表示天气、季节、时间或事物的状态。
1）指时间
It’s early spring， but it’s already very hot.
虽然是初春，但已经很热了。
What time is it by your watch？
你表上几点了？
2） -What’s the weather like today？
- It’s very cold today.
3）指距离
It’s about 15 minutes’ walk from here to the bar.
从这儿到酒吧步行需15分钟。
How far is it from your company to your home ？
从你家到公司有多远？
当指示代词用
1）用以明确身份
It’s your mother on the phone.
是你母亲来的电话。
Hello， Peter， it’s Mike here.
喂，彼得，我是迈克。
Hi， it’s me.
嗨，是我。
2）指代this、that
This is your plan， isn’t it？
-What’s this？
-It’s a book.
it当作形式代词的用法：
1）it当作形式主语的用法
在英语当中，常用it来替代做主语的不定式、ing和从句，以保持句子的平衡。
A. 替代不定式
It took me three hours to finish the work.
完成这项工作花了我三个小时的时间。
It’s kind of you to help me.
你能帮我真是太好了。
It’s hard for us to learn English.
对我们来说学英语有点难。
B. 替代ing
It’s no use crying over spilt milk.
覆水难收。
It’s no good doing it.
做这件事没有好处。
It’s well worth reading the book.
这本书很值得一读。
It’s great fun climbing mountains on rainy days.
雨天爬山真有趣。
C.替代从句
It’s a fact that the population is still increasing.
人口仍在增长是个事实。
It’s certain that they will come here to see us.
他们要来看我们这是一定的。
It’s said that he is going abroad with his parents.
据说他要随他的父母去国外。
It seems that it is going to rain.
天看起来好像要下雨了。
常用it代替从句的句式有：
It’s adj/n that-clause.
It’s said/believed/known/reported/supposed/ordered that-clause.
据说/认为/知/报道/ 认为/命令…..
It seems/appears that-clause.
看起来好像…..
It turns out that-clause.
结果是……
It happens that-clause.
碰巧……
It occurs tothat-clause.
It flashes on/uponthat-clause.
某人想到……
It strikesthat-clause.
使某人觉得……