文档介绍：It的用法
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1. 指事物
作为人称代词,it 可以除人以外的一切事物或动物。如:
I dropped my watch and it broke. 我把手表掉在地上摔坏了。
It’s hard work, but I enjoy it. 工作很辛苦,可是我乐意干。
“Where is the dog?” “It’s in the bedroom. ” “狗在哪?”“在卧室里”。
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it 指人主要用于指不性别不明的婴儿或用于确认某人的身份。如:
Is it a boy or a girl? 是男孩还是女孩?
There is a knock on the door. It must be the postman. 有人在敲门,一定是邮递员。
【说明】在答语中,常用来指本人,如说 It’s me。
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代词 it 还可用于代替指示代词this, that 以及复合不定代词 something, anything, nothing等。如:
“What’s this?” “It’s a new machine. ” 
“这是什么?”“是一种新机器”。
Nothing is wrong, is it? 没出什么问题,是吗?
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1. 基本用法
it 作非人称代词的用法,主要用于指时间、距离、价值、天气、气候及温度等自然现象。
1. It is Friday today.
2. It was very cold last Monday.
3. It is about 8:30 now.
4. It is about 25km from Linquan to Fuyang.
5. It lies in the south of Anhui.
6. It is 40°C ! You got a high fever!
date
weather
time
distance
place
temperature
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It’s time for sth. 该做某事了。
It’s time to do sth. 该做某事的时候了。
It’s time for sb to do sth. 某人该干某事了。
It’s (about / high) time + that-从句. 某人该做某事了。(从句谓语用过去式,有时也用“should+动词原形”)
It’s first (second) time + that-从句. 某人第几次干某事。(从句谓语用现在完成时)
It’s + 时间段+ since. 自从……有一段时间了。
It’s + 时间段+ before. 过多长的时间才… it’s=it was
It‘s + 时间段+ that. …多久了
It's + 时间段+ when ...是在某个时刻
It is time for breakfast.
It is time to have breakfast.
It is time for us to have breakfast.
It is the first time I’ve been here.
It is two weeks since I saw him
It's ten years before I graduated.
It's ten years that I've lived here for
It was ten years ago when I graduated
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1. 基本用法
当不定式、动名词、从句等复杂成分用作句子主语时,为保持句子平衡,通常把真正的主语放在句末,而在句首使用形式主语it。如:
It’s very important to remember this. 记住这一点很重要。
It’s