it的用法总结简单
it最常见的是做普通代词，代指前文提到的某种物体或某个事情，比如I bought a table，it代指前面的table。第二个用法是用it或there来代指不确定的东西。第三种用法是it做强调句的形式主语。
扩展资料
1、it一般指无生命的物或动物
I have bought a chair. It is made of pine wood.
我买了一把椅子。它是松木做的。
I am taking the meat back to the shop because it isn’t good.
我要把肉退回店里，因为它不好了。
Learning is a bitter root, but it bears sweet fruit.
学习根苦果甜。
It was a stupid question, of course.
当然，这是个愚蠢的问题。
How much is it, Dad?
多少钱，爸爸？
It is a beautiful place.
这是一个美丽的地方。
It was the earthquake.
那是地震。
但可以指代婴儿，或不清楚对方性别
The baby is crying. It must be hungry.
婴儿在哭。它一定饿了。
I did not disturb the child because it was sleeping.
我没有打扰那孩子，因为他正在睡觉。
Who is it speaking?
谁打来的`电话?
Sure. Is it someone your family knew?
当然。是你家人认识的人吗？
2、it某件事
（it指代的是什么，从上下文来判断）
Take it easy.
不要紧张。
I'd rather not talk about it.
我不想多谈此事。
It is your affair, not mine.
这是你的事，不是我的事。
When she talked to people, she liked to do it face to face.
当她和别人交谈时，她喜欢面对面谈。
3、做主语，指代时间、日期、距离、天气等
it做非人称代词
It is snowing on the mountains. 山上正在下雪。
What time is it? It’s two-thirty.
几点了？现在是两点半。
It's been almost a week and she hasn't been coughing today.
快到一个星期了，她今天没咳嗽。
It was nearly dark and she was a good fifty miles from home.
天快黑了，她离家还有50英里远。
It’s only five-mile ride from here.
离这里只有五英里的路程。
It’s Christmas, and the family are on vacation in Europe.
今天是圣诞节，一家人正在欧洲度假。
4、形式主语
真正主语可能是动词不定式，动名词或主语从句，一般后置。
It is dangerous to play with fire.
玩火是危险的。
In all things, it is better to hope than to despair.
凡事抱希望为佳，不应悲观而失望。
It is a great art to laugh at your own misfortune.
对己之不幸付之一笑，这是一门伟大的艺术。
It is no use crying over spilt milk.
覆水难收。
It's no use arguing with a drunk.
和酒鬼理论是没用的。
It seems that the disease is now under control.
看来这种病现在已得到控制。
It's a pity that you have to go so soon.
很遗憾你这么快就得走了。
Divorce is a fire exit. When a house is burning, it doesn’t matter who set the fire. If there is no fire exit, everyone in the house will be burned!
离婚是个消防出口。房子着火时，谁放的火都无关紧要。如果没有消防出口，房子里的每个人都会被烧死！
5、形式宾语
真正宾语可能是动词不定式，动名词或宾语从句，一般后置。
I find it impossible to get on with Li Tao.
我发现和李涛相处不下去。
I find it interesting that she claims not to know him.
我觉得有趣的是她声称不认识他。
He found it exciting riding the roller coaster.
他觉得坐过山车很刺激。
I thought it best to call first.
我想最好先打个电话。
I thought it best (that) I leave them with a neighbour.
我想最好把它们交给邻居。
I took it for granted that we should build new roads.
我认为我们应该修新路是理所当然的。
6、用在强调句it's …who/that…中
强调主语，宾语或状语
（被强调的是人，用who/that；其他用that）
It was John who broke the window.
是约翰打破了窗户。
It was his parents that he turned to for advice.
他向父母寻求建议。
It was the first money that he had ever had.
这是他有生以来的第一笔钱。
It was when he was in Paris that he became a well-known writer.
他是在巴黎时成为一位著名作家的。
