高考英语It的用法
It是高考英语中一个极其重要的词，其用法多样，在不同的语境中具有不同的意义。下面我们将从it的用法、句型和固定搭配三个方面进行讲解。
一、it用作实词
1、表示时间、天气、距离、温度等自然现象。例如：It is Monday today.今天是星期一。 It is raining outside.外面正在下雨。 It is 5
kilometers away from here.距离这儿有5公里远。
2、表示观点、看法、态度等主观想法。例如：I think it is a good
idea.我认为这是一个好主意。 We think it is important to learn
English well.我们认为学好英语很重要。
二、it用作形式主语
当不定式、动名词或从句作主语时，为了保持句子结构平衡，避免头重脚轻，常用it作形式主语，代替不定式、动名词或从句，而把真正的主语放在句尾。例如：It is important to learn English well.学好英语很重要。 It took me an hour to finish the homework.我花了一个小时完成作业。 三、it用作形式宾语
当不定式、动名词或从句作宾语时，为了保持句子结构平衡，避免头重脚轻，常用it作形式宾语，代替不定式、动名词或从句，而把真正的宾语放在句尾。例如：I think it is important to learn English
well.我认为学好英语很重要。 He found it hard to learn English
well.他发现学好英语很难。
四、it用于强调句型中
强调句型是英语中一个重要的句型，用于突出强调某个成分，特别是主语、宾语和状语等。在强调句型中，it没有实际意义，只是起到引导作用。例如：It is I who am the best student in my class.我是班里最好的学生。 It was he who saved the little girl.是他救了那个小女孩。
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1 / 3 It 的用法
1： it 做形式主语，不定式to do 或that 引导的句子做真正的主语
例句: It is important for us to protect environment. 保护环境对我们来说是很重要的。（it 做形式主语，真正的主语是to protect environment）即 to protect environment is important for us 是本句，但这样显得头重脚轻，所以用it 做形式主语.
例句: It is common knowledge that science and technology is the first productive force.( it 做形式主语，that 引导的句子做真正的主语
2：it 做形式宾语，不定式to do 或that 做真正的宾语
例句：He thinks it very hard to master a foreign language.他认为掌握一门外语是很难的。（he做主语，thinks 做谓语，it 做形式宾语，very hard 做宾补，to master a foreign language 做真正的宾语，即He thinks to master a foreign language very hard.
例句：He thinks it very essential that he should have a decent job.他认为他应该有一份体面的工作是很必要的即He thinks that he should have a decent job very essential.
3: it 用于强调句，其结构是it is \was+强调部分+that
高中英语it的用法
一、代词it
专项练习
1. I was disappointed with the film. I had expected to be much better.
A. that B. this C. one D. it
2. — Who is knocking at the door?
— Perhaps is Jerry. 用 法 例 句
代替前文提到过的东西或事情，用作人称代词。 This is a new dictionary. I bought it yesterday.
这是一本新词典，我昨天买的。
Tom joined the army last mouth. Do you know about it?
汤姆上月入伍了，你知道这事吗？
代替指示代词，起着this或that的作用 Is this your car? No, it isn’t. 这是你的汽车吗？不是。
What’s that?—It’s a video. 那是什么？它是一台录像机。
Whose room is this?—It is theirs.这是谁的房间，是他们的。
指明某人或某物的身分，还可指不明性别的婴儿 Who’s there? It’s me. (It’s John) 谁在那儿？是我。（是约翰）
Go and see who it is that rings. It’s Bill.
去看看是谁来的电话，是比尔。
The Greens have a new baby. It’s lovely.
格林家有一个新生婴儿。它很可爱。
指时间，距离，自然现象（天气，气候，明暗）量度，价值等 It’s Sunday today. 今天是星期天。
It’s three months since he came here.
自从他来到这里，已经三个月了。
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高考英语语法知识之It 的用法总结
1．It is + 被强调部分 + that ...
该句型是强调句型。将被强调的部分放在前面，其它部分置于that之后。被强调部分可以是主语，宾语，状语。强调的主语如果是人，that可以由who换用。
如果把这种句型结构划掉后，应该是一个完整无缺的句子。这也是判断强调句型与其它从句的方法。
It was they that (who) cleaned the classroom yesterday. It was in the street that I met her father.
2．It was not until + 被强调部分 + that ...
该句型也是强调句型。主要用于强凋时间状语，译成汉语＂直到．．．才．．．＂，可以说是 not ... until ... 的强调形式。
It was not until she took off her dark glasses that I realized she was a famous film star.
= Not until she took off her dark glasses did I realize she was a famous film star.
= I didn’t realize she was a famous film star until she took off her dark glasses.
3．It is clear ( obvious, true, possible,certain....) that .....
该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为＂清楚（显然，真的，肯定．．．）＂ 是主语从句最常见的一种结构。
It is very clear that he’s round and tall like a tree. = That he’s round and tall like a tree is very clear.
