高中英语语法知识之It的用法总结教学内容
高考英语语法总复习7it的用法课件
A. it
B. her
it作形式宾语
C. that
D. this
★it知识点补充★
it变化成形物代形式 注意区分its和it’s
it→its(它的)
it’s=it is
it和现三单 It sounds good.
it
it变化成反身代词 it→itself(它自己)
it变化成复数形式 it→they(他们 主格) it→them(他们 宾格)
注意: 某些动词(短语)后接从句时要用it作形式宾语，再接从句，构成“动词(短语)+it+that/if/when/...从句”，如： ①I hate/like it when... 我讨厌/喜欢... ②You should see to it that... 你应该确保... ③You can depend on it that... 你可以相信... ④I can’t help it if... 如果...我也没有办法 ⑤I would appreciate it if... 如果...我将感激不尽
★常用it作形式主语的句式★
(5)用于It is/was...that/who... 强调句中 1.It was they that/who cleaned the classroom yesterday.
昨天是他们打扫的教室。
2.They cleaned the classroom yesterday.
were using ___it___ every day.
此处作using的宾语，根 据语境可知，所填词指 代上文的railway，故填
it
(4)作形式主语或形式宾语，代替动名词、不定式或从句
2.I find it difficult to work with him.
高中英语语法知识之It的用法总结
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。
I.wa.the.tha.(who.cleane.th.classroo.yesterday.I.wa.i.th.stree.tha..me.he.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.no....unti....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...didn’.realiz.sh.wa..famou.fil.sta.unti.sh.too.of.he.dar.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.4.I.i.importan..necessary.right.strange.natural....tha....由于主句中的形容词不同, tha.后的从句中要用虚拟语气（shoul..动词原形）, shoul.可以省去。
英语中it的语法知识点总结 教案
（章节教案首页）课题：Grammar--it的语法知识点总结授课时间：2022 年月日教学时数：（2 ）学时，其中理论（2 ）、实验（0 ）学时、上机（0 ）学时、其它（0 ）学时，其它是指：教学目标与要求：情感目标：通过课上师生互动和生生互动，增强师生之间的感情；使学生能够体会到学习英语的目的在于交流和应用。
知识目标：学习it的用法，正确分辨出含it的常用句型，提高解题速速度。
技能目标：能正确使用包含it的各种句型，使学生形成良好的语言习惯。
教学方法设计：归纳法，讲练结合法，举例法，多媒体辅助教学法教学重点与难点：教学重点: it作为形式宾语和形式主语的用法是本课的重点。
教学难点：归纳出it语法句型的规律。
主要参考资料：杨萍，《大学英语综合教程》，南开大学出版社，2019年8月.史洁，《致用英语语法教程》，外语教学与研究出版社，2021年5月. 教具使用：多媒体设备课后作业：1.用思维导图的形式，自行总结it的各种用法和常见句型；2.预习下节课内容。
教学反思：★Part Ⅰ导入新课1.翻译几个谚语（小组成员合作，选派代表进行抢答，答对者给与加分奖励）；2.教师根据所翻译的谚语，总结出本节课的语法重点在于it的用法讲解与学习。
接下来根据所展示的几个句子，让学生简单分析总结it的用法。
学生做出分析总结后，教师做简单的解释。
1）作人称代词（personal pronoun）,可用来代替人、物或事情。
2）作指示代词（demonstrative pronoun）,可用来代替this,that。
3）作非人称代词（impersonal pronoun）,表示时间、天气、季节、距离、环境等。
从学生已有认知开始，带领学生温故知新。
★Part II 讲解新课步骤一:it作形式宾语1）Introduce the structure of “6123”to the students:6指的是主句中常用的动:think,believe,make,find,consider,feel; 1指的是形式宾语it2指的是宾补的两种形式：形容词或名词；3指的是真正宾语的三种形式：不定式短语，动名词短语或that从句。
it用法总结高中
it用法总结高中【导语】作者在这里给大家带来it用法总结高中（共17篇），希望大家喜欢!篇1：高中it用法总结it作人称代词：1、指代事物。
作为人称代词，it 可以指除人以外的一切事物或动物。
如：Sam picked up some knowledge of the puter just by watching others working on it. 山姆只是凭借看别人操作电脑就学到了一些电脑知识。
(指the puter) (山东)2、指代人。
主要用于指婴儿或未知的人。
如：I was just going to cut my rose bushes but someone had done it. Was it you? 我正要剪切我的玫瑰丛但(发现)有人已经这样做了。
是你干的吗？(未知的`人) (湖南某)3、代替某些代词。
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等。
如：—What’s this / that? 这/那是什么？—It’s an orange. 这/那是一个橘子。
it作非人称代词：1、it用于指时间、距离、价值、自然现象、环境等。
如：It rained heavily in the south, causing serious flooding in several provinces. 南方下了大雨，在几个省造成了严重洪灾。
(指自然现象) (天津某)2、it指代前面提到过的或谈话双方都明白的事情或情况。
篇2：it用法总结高中I didn't mean to break it— it was an accident.我不是故意打碎它的—这是个意外。
If it doesn't fit, you can always take it back.要是它不合适，你总还可以把它退回去嘛。
It didn't seem worthwhile writing it all out again.把这再都写出来似乎不必要。
it用法总结ppt课件
It was 3 days before he went to Beijing. It will be not long before he finishes his job.
8
2）.It is +v-ed +that 从句 ① It is said (reported， learned....) that ...
据说（据报道，据悉．．．）“。 It is said that he has come to Beijing.
②. It is suggested ( ordered /demanded/insisted/commanded... ) that ...
②. It is important ( necessary， right， strange， natural...) that ... that 后的从句中要用虚拟语气（should + 动词原形）， should 可以省去，建议记住该句型中的形容词。 It is important that we (should) learn English well.
It is time that children went to bed.
② It is the first ( second ... ) time that ... “是第一（二）．．．次．．．”。
It is the first time I have been here. = This is the first time I have been here.
it用法教学设计
it用法教学设计《it 用法教学设计》一、教学目标1、让学生了解“it”在不同语境中的基本用法。
2、帮助学生掌握“it”作形式主语和形式宾语的结构及用法。
3、引导学生正确运用“it”进行句子的翻译和写作。
二、教学重难点1、重点（1）“it”作人称代词，指代事物、动物或不明身份的人。
（2）“it”表示时间、天气、距离等。
（3）“it”作形式主语，常见的句型结构如：It is ＋ adj ＋（for sb）to do sth（4）“it”作形式宾语，常见的句型结构如：find ／ think ／ make ＋it ＋ adj ＋ to do sth2、难点（1）学生对“it”作形式主语和形式宾语的理解和运用。
（2）如何让学生在实际语境中准确判断“it”的用法。
三、教学方法1、讲授法：讲解“it”的基本用法和重点句型结构。
2、练习法：通过练习题让学生巩固所学知识。
3、情境教学法：创设具体的语言情境，帮助学生理解和运用“it”。
四、教学过程1、导入（5 分钟）通过展示一些包含“it”的句子，如“It's a dog” “It's sunny today” “It's five kilometers from my home to school” 等，引导学生观察“it”在这些句子中的用法，从而引出本节课的主题——“it”的用法。
2、知识讲解（20 分钟）（1）“it”作人称代词展示例句：“Look at the cat It is cute” 解释“it”在这里指代前面提到的“the cat”。
再举例：“Who is knocking at the door? It's me” 说明“it”在不知对方身份时的使用。
（2）“it”表示时间、天气、距离等给出句子：“It's six o'clock now” “It's rainy” “It's about 200 meters from here to the supermarket” 分别讲解“it”在表示时间、天气、距离时的用法。
高中英语it的用法的归纳总结
高中英语it的用法的归纳总结以下是关于 it 的用法的一些归纳总结:1. 当 it 作为形式主语时，常用动词不定式或名词形式充当主语，其后面通常会加上 for 或 to 引导的短语。
例如：- It"s important to study hard.(努力学习很重要。
)- It"s a beautiful day.(今天天气很好。
)- It"s difficult to imagine a better place to live.(无法想象一个更适合居住的地方。
)2. 当 it 作为形式宾语时，通常用不定式或名词形式充当宾语，并在其后加上 for 或 to 引导的短语。
例如：- I appreciate your help.(感谢你的帮助。
)- It"s a great opportunity for me to learn new skills.(这是一个我学习新技能的好机会。
)- It"s necessary to clean the room.(打扫房间有必要。
)3. 当 it 作为实义主语时，表示某一具体事物或人物。
例如： - It"s a beautiful day, isn"t it?(今天天气很好，是吗？) - It"s yours, isn"t it?(这是你的吗？)4. 当 it 作为强调句的结构时，通常位于句首，其后是句子的主要成分。
例如：- I don"t know who it was that called me yesterday.(我不知道昨天是谁给我打电话。
)- It was yesterday that I visited my grandmother.(昨天我去看望了我奶奶。
)5. 当 it 作为单数名词时，通常指某一类人或物中的一个。
例如：- It"s a police car.(这是一辆警车。
高中英语it的用法课件-(详细有高考题-精品)
动词 +it + that + clause
enjoy, like, / love, dislike, appreciate hate, don't mind, be fond of, feel like, see to / depend on / insist on
例 : I hate it you can dance so well but I can't.
2.非人称代词it
it有时并不指具体的东西，而泛指天气、时间、环境等， 称为非人称的it： ⑴.指天气：
It is a lovely day, isn’t it? It is a bit windy.
⑵.指时间:
It was nearly midnight when she came back.
⑶.指环境:
no good 3. S + V + it +
no use
+ doing sth.
形式宾语归纳
该句型中的it 作形式宾语，记忆方便---“6123结构”。
6 主句中常用的动词： think,believe,make,find,consider,feel； 1 形式宾语it； 2 宾补的两种形式：形容词或名词； 3 真正宾语的三种形式：
an honour
…
… said It is / was p.p. known + that-clause believed
…
1. 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。
高考英语It的用法
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的用法归纳高中
it的用法归纳高中高中阶段，“it”这个小小的单词，可是有着大大的用处！今天咱们就来好好归纳一下“it”在高中英语中的各种用法。
先来说说“it”作人称代词的时候。
这时候，“it”可以指代除人以外的一切事物或者动物。
比如说，“Look at the dog It is so cute”这里的“it”就是指代前面提到的“dog”。
“it”还能用来指代不明性别的婴儿或者身份不明的人。
想象一下，有人敲门，你不知道是谁，这时候你可能就会问：“Who is it?”再讲讲“it”作非人称代词的情况。
“It”可以表示天气、时间、距离、温度等等。
就像“It is sunny today”说的就是今天的天气晴朗。
“It's five o'clock”这就是在说时间是五点钟。
然后呢，“it”在高中英语中还有一个很重要的用法，那就是作形式主语或者形式宾语。
这个有点复杂，咱们慢慢说。
比如“It is important to learn English well”这里真正的主语是“to learn English well”，为了让句子看起来更平衡，就用“it”来作形式主语。
还有“It is ＋ adj ＋for/of sb to do sth”这个句型，同学们可得好好记住。
到底用“for”还是“of”，得看形容词是形容事情还是人。
如果是形容事情，就用“for”；要是形容人，那就用“of”。
比如说，“It is difficult for me to solve this problem” 这里“difficult”是形容“solve this problem”这件事，所以用“for”。
再看“It is kind of you to help me” 这里“kind”是形容“you”这个人，所以用“of”。
我想起之前教过的一个学生，他总是弄不清楚“it”作形式主语和宾语的用法。
有一次做作业，他错了好多相关的题目，那叫一个郁闷。
高中英语语法-It-的用法课件人教版课件
It-作为形式主语
It-作为形式宾语
It-引导强调句型
It-在固定搭配中 的用法
回 顾 I t-的 用 法 的 重 点 与 难 点
It-作为形式主语
It-作为形式宾语
It-引导强调句型
It-在固定搭配中的用法
对未来学习的展望
掌握更多英语语法知识 提高英语阅读和写作能力 培养英语语感和语用能力 拓展英语文化背景知识
古 英 语 和 中 世 纪 英 语 中 的 I t用法
It-在强调句型中的用法和演 变
I t-的 用 法 的 文 化 背 景
单击此处添加标题
强调句型：在英语中，使用“It is/was...that...”结构来强调某个句子成分， 如主语、宾语或状语。
单击此处添加标题
形式主语：使用“It”作为形式主语，代替真正的主语，使句子更加简洁。
主语
It-作为形式主 语，用于避免 句子头重脚轻
It-作为形式主 语，用于构成 固定句型结构
I t-作 为 形 式 宾 语
It-作为形式宾语的定义 It-作为形式宾语的用法 It-作为形式宾语与真正宾语的区别 It-作为形式宾语在句子中的作用
I t-引 导 强 调 句 型
强调句型结构：It is/was +被强调部分+that/who+其他部分
It-作为形式主语的用法举 例
It-作为形式主语与真正主 语的区别
I t-作 为 形 式 宾 语
定义：It作为形式宾语，用于代替真正宾语的位置
用法：常与make、take等动词连用
特点：使句子结构更加平衡，避免头重脚轻
例子：如“It takes me an hour to finish my homework every d a y. ”
高考英语语法之it的用法
2. I hope there are enough glasse for each guest to have ________.(NMET 1995) A.it B.those C.them D.one 解析:答案为D.本题考查替代词it和 one的区别.it用于替代同类的,特定的, 同一的事物;one替代同类的,泛指的 人或物.根据题意"我希望有足够的杯 子使每个客人有一个."可知应用one 泛指enough glasses中的一个.
4)It is no use/ good + doing sth. It is no use trying again = It is of no use to try again. (5)It is + 被强调部分 + that/who + … Was it in the street that you met her? Who was it that called him "comrade"? It was not until yesterday that I met my old friend. It is in a small factory that my brother is going to work.(注意上述各句均为强调句型的"考点") 比较:It is a small factory where my brother is going to work.(定语从句)
(8)作形式宾语. I think it no use arguing with him. I found it very interesting to study English. He made it clear that he was not interested in that subject. (9)用于强调结构. It was Xiaoming whom ( that )I met in the street last night. It was in the street that I met Xiaoming last night. It ws last night that I met Xiaoming in the street.
高中英语It用法详解[共33页]
![高中英语It用法详解[共33页]](https://img.taocdn.com/s3/m/bde27d71168884868662d601.png)
It的用法解析1.it在强调句中用法：⑪It is + 被强调部分+ that …该句型是强调句型，被强调部分可以是主语、宾语、表语或状语；强调的主语如果是人时，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依据；①It was they that <who> cleaned the classroom yesterday.昨天是他们打扫的教室。
（强调主语）②It is her sister that I have fallen in love with.我爱上的是她的姐姐。
（强调宾语）③It was under the tree that he found his missing purse.他是在树底下找到自己丢失的钱包。
（强调地点状语）④It was last week that I visited the Shanghai Expo.我是上周参观的上海世博。
（强调时间状语）⑫It is not until + 被强调部分+ that …该句型是＂not… until…句型”的强调句，意为＂直到．．．才．．．＂，that后的从句要用肯定句，不可再用否定句；【注意：not until置于句首时，主句用倒装结构；】①It was not until she took off her dark glasses that I recognized she was a famous film star. （强调句）直到她摘下墨镜，我才认出她是一名著名的电影明星。
②Not until she took off her dark glasses did I recognize she was a famous film star. （倒装句）直到她摘下墨镜，我才认出她是一名著名的电影明星。
⑬强调句型的特殊疑问句结构：特殊疑问词+is/was + it + that …；①Who was it that you want to see? 你究竟想见谁？②Why is it that you want to change your mind? 你究竟为什么要改变主意？⑭强调句型的一般疑问句结构：Was/Is it +被强调部分+that…；①Was it they that cleaned the classroom yesterday? 昨天是他们打扫的教室吗？②Was it last week that you visited the Shanghai Expo?你是上周参观的上海世博吗？【注意事项】⑪强调句型结构基本要点：①强调句型中，通常强调主语、宾语、状语等；一般而言，该结构<It is/ was … that …>不可以强调谓语，若强调谓语，则用助动词do/does/did，其后的谓语用动词原形；(a) She did go there alone.她确实是一个人独自去那儿的。
高中英语语法知识之It的用法总结
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.4. It is important ( necessary, right, strange, natural...) that ...由于主句中的形容词不同，that 后的从句中要用虚拟语气（should + 动词原形），should 可以省去。
高中英语代词it讲解（很完整的讲解）
高中英语代词it讲解（很完整的讲解）代词it一、指代前面提到过的名词，而且就是那个名词，即同类同物。
This is our new car. I bought it yesterday.I've bought a new bike and it cost me 100 dollars.二、指代前句所述的情况。
He smokes in bed and I don’t like it.Tom's mother kept telling him that he should work harder, but it didn't help.Yang Liwei was the first Chinese to be sent up into space. It made the Chinese proud.三、指动物或不考虑性别的婴儿。
Where is the cat? It’s under the bed.The baby cried when it was hungry. Is it a boy or a girl?四、在情景中确认某人或事物。
Who is it? It’s me. What’s this? It’s a map.There is a knock on the door. It must be the postman.五、指时间、距离、天气或环境等It is snowing. It was very quiet in the garden.What time is it? It’s seven o’clock.It’s time for supper. =It’s time to have supper.It’s about 50 kilometers from here to my home.六、It takes/took sb + 时间段+ to do sth. 某人做某事花了……时间。
高中英语it的基本用法
高中英语it的基本用法''It'' 用法及其句型和固定搭配，是高中英语语法的重点、难点，又是近几年高考的热点，因此应给予充分的重视。
初小内容归纳：一、it指代（后行）作用:1.It的基本用法是用来指代上文所提到的事物。
如橙子妈妈经常给学生用最简单的方法举例：I have a pen and I like it.2.学会区分这几组词：it, that, one, the one, ones, the ones用于指代:橙子妈妈归纳的口诀：it指代同名同物；one指代同名异物, that 指代抽象物体居多即it代替上文提及的原物(复数用they)；one指代上文提及的、泛指的可数名词单数（复数ones）；that指代上文提及的定指的可数名词单数或不可数名词（复数those）, the ones 相当于these, those。
注意：指代不明身份（例如有人在外面叫你或者敲门）或性别的人（如小baby）也用it；指代喜爱的事物或宠物也可用she / he。
A：Who''s it (knocking at the door)? B: It''s me.二、虚义it:（初中阶段的重点内容）虚义it指用作没有具体语义的主语，如表示时间、天气、距离、温度等概念的用法。
It is a good day.It cost me 10 dollars.高中内容归纳一、形式it:由于句子结构的需要，常常把it作形式主语，而把真正的主语放后置。
小伙伴们熟不熟悉！1．形式主语：不定式、动名词以及主语从句作主语时，为避免“头重脚轻”，要将真正的主语后置。
It is obvious that he will win the match. （主语从句作主语）It was worthwhile searching for his ''roots.'' （动名词作主语）It took me 10 dollars to buy the book. （不定式作主语）2．形式宾语：当不定式、动名词、that 从句作宾语，又有自己的宾语补语时，要用it 作形式宾语，而把真正的宾语后置。
高中英语语法It的用法总结
高中英语语法It的用法总结一、It 用作实词表达以下概念:指代前文提到的事物，如前文中的this, that；替代前文中的内容；指代一位性别不明的小孩或未知的人；指代未指明但谈话双方都知道的那件事；指代时间、天气、气候、距离等自然现象……二、It 用作形式主语替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。
It 作形式主语的常见句型：1. 代作主语的动词不定式，其句型为:(1) It be adj. (for sb.) to do sth.此处adj. 通常为描述事件的形容词：easy, difficult, hard, necessary, unnecessary, possible, impossible, likely, unlikely, right, wrong, important, unimportant, legal, illegal, well-mannered, ill-mannered, polite, impolite, clear, obvious, certain, suitable, proper, fit, useful, useless, dangerous…例: It is illegal (for a teenager) to drive a car without a license.(2) It be adj. of sb. to do sth.此处adj. 通常为描述人的形容词：kind, unkind, nice, rude, cruel, considerate, thoughtful, thoughtless, careful, careless, silly, foolish, stupid, clever, wise, crazy.例: It's kind of you to help me with the problem.(3) It替代作主语的动名词的常见句型:It's no good/use doing…It's (well)worth doing…It's (well)worth one's while doing/to do…It's (well)worth while doing/ to do例: It's no use crying over spilt milk（覆水难收）.2. It替代作主语的从句常见句型：(1) It is + noun +从句例: It is no secret that the president wants to have a second term at office.(2) It is adj. +clauseIt's surprising that… (should)………竟然……It's a pity/shame that…(should)………竟然……例: It's important that you should apologize to her for your rudeness.(=It's of much importance that you should apologize to her for your rudeness.)(3) It verb sb. + clause= It is v-ing + clauseIt+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze/bother/concern/frighten/please/anger sb. that…例: It worried me that she drove so fast.(= It was worrying that she drove so fast.)(4) It verb (to sb.) that…= sb/sth verb to do例: It (so) happened/chanced that they were out.(= They happened/chanced to be out.)(5) It is v-ed that…=sb/sth is to do(verb=say, report, think, believe, hope, expect, agree, accept, decide, determine, intend, plan, understand, know）例: It is said that the couple have gotten divorced.(=The couple are said to have gotten divorced.)(6) It is v-ed that … (should)…(verb=demand, request, require, order, suggest, advise, recommend例It is suggested that they should begin with the third question.三、It 作主语的句型1. It takes sb. … to do…(=sb takes…to do…)某人用多长时间做某事例: It took the men a week to mend our roof.(= The men took a week to mend our roof.)2. It's (just)(un)like sb. to do…（不）像某人做某事的风格例: It was (just) like him to think of helping us.3. It's (about/high) time that… should /v-ed…是该做某事的时候了例: It's(about/high) time that we should take action.4. It's the x-th time (that) … have v-ed…第几次做某事了例: It's the third time that he has failed the driving test.5. It is/has been… since …continuous v-ed(延续性动词) 某动作持续了多长时间例: It's 10 years since he lived here6. It was(not)… before…过(不)了多长时间某动作发生了例: It was not long before they arrived.四、It 作形式宾语用来替代作宾语的从句、动词不定式、动名词，而把真正作宾语的从句、动词不定式、动名词置于句尾。
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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.4. It is important ( necessary, right, strange, natural...) that ...由于主句中的形容词不同，that 后的从句中要用虚拟语气（should + 动词原形），should 可以省去。
It is important that we (should) learn English well. It is necessary that he (should) remember these words.5. It is said (reported, learned....) that ...该句型中的it 仍是形式主语，真正主语是that 引导的主语从句。
该结构常译为＂据说（据报道，据悉．．．）＂。
It is said that he has come to Beijing.6. It is suggested ( ordered ... ) that ...主句中的过去分词是表示请求，建议，命令等词时，that后的从句要用虚拟语气（should + 动词原形），should 可以省。
常译为＂据建议；有命令．．It is suggested that the meeting ( should ) be put off.It was ordered that we ( should ) arrive there in two hours.7. It is a pity ( a shame ... ) that ...该句型中，that后的从句一般用虚拟语气（should + 动词原形），should可省去．表示出乎意料，常译为＂竟然＂。
没有这种意义时，则不用虚拟语气。
It is a pity that such a thing ( should ) happen in your class. It is a pity that he is ill.8. It is time ( about time ,high time ) that ...该句型中that 后的从句应该用虚拟语气，值得注意的是①常用过去时态表示虚拟．②有时也用should + 动词原形，should 不能省。
常译为＂是（正是）．．．的时侯．．．＂。
It is time that children should go to bed. = It is time that children went to bed.9. It is the first ( second ... ) time that ...该句型中的that 从句不用虚拟语气，而用完成时态。
至于用什么完成时态，由主句的谓语动词的时态决定。
如果是一般现在时，后面从句用现在完成时态；如果是一般过去时，后面从句则用过去完成时态。
该结构中that 可以省去；it有时用this / that 替换．常译为＂这是某人第几次做某事了＂。
It is the first time I have been here. = This is the first time I have been here.10 It is the +形容词最高级+ 名词+ that + …..该句型中的that 从句不用虚拟语气，而用完成时态。
至于用什么完成时态，由主句的谓语动词的时态决定。
如果是一般现在时，后面从句用现在完成时态；如果是一般过去时，后面从句则用过去完成时态。
该结构中that 可以省去；it有时用this / that 替换．常译为＂这是某人做过的最…的事情＂。
This is the best film that I have ever seen . That was the worst song that he had heard .11. It is .... since ...该句型主要用作处理瞬间动词的完成时，又要和表示一段时间的时间状语连用的问题。
主句中是时间作表语，其时态是现在时或完成时，since 引导的从句通常是一般过去时态，而且是瞬间动词。
如果主句是一般过去时，从句则用过去完成时。
It is ( has been ) 5 years since his father died.12. It is ... when ...该句型中的when 引导的是一个时间状语从句，主句中的it 指时间，表语由具体的时间充当。
常译为＂当．．．的时候，是．．．＂。
It was 5 o’clock when he came here.比较：There was a time when + 定语从句（曾经一度….；有一个时期…）There was a time when Iraq was one of the strongest countries in the world .There was a time when I was disappointed and wanted to leave here .13. It be ... before ...该句型主句中的it 指时间, 主句中的时态常是将来一般时或过去时两种时态．主句中的表语多是long, not long , 3 days , 2 weeks 等表示时间段的词或短语。
常译为＂．．．之后．．．＂。
It was 3 days before he went to Beijing. It will be not long before he finishes his job.14. It happens (seems, looks, appears ) that...该句型中it是形式主语，that 引导的是主语从句，主句中的happen , seem等词是不及物动词．It happened ( so happened ) that he met his teacher in the street. 碰巧．．It seems that he will be back in a few days. 看来．．．15. It looks ( seems ) as if ...该句型中it无意义。
as if 引导一个状语从句。
常译为，＂看起来好象．．．＂如果与事实不相符合，则用虚拟语气．It looks as if he is ill.It looks as if he were ill. It seemed as if he were dying.16. It takes/costs sb. ... to do sth.该句型中的不定式是真正的主语，it是形式主语，句型中的直接宾语是时间。
常译为＂做．．．要花费某人．．．＂。
It took thousands of people many years to build the Great Wall.注意：当主语和表语都是不定式时，不能用it 作形式主语代替动词不定式。
To see is to believe . To respect others is to be respected .17. It is kind ( of sb. ) to do sth.该句型中的不定式短语是真正主语，如果不定式的逻辑主语是由of引起，主句中的形容词必须是能表示逻辑主语特征的形容词。
常见的有：bad , brave , careless, clever , cruel , foolish , good （好心的）, honest , horrible , kind , lazy , modest , naughty , nice（有教养的）, polite, rude , silly , stupid , wise , wrong（错误的）等。
这个句型可以改写为：sb. is kind to do sth.It is kind of you to say so. = You are kind to say so.18. It is necessary ( for sb. ) to do sth.如果不定式的逻辑主语是由for引起，主句中的形容词通常是表示重要性，紧迫性，频繁程度，难易，安全等情况的形容词。
常见的形容词有：①important, necessary, natural ②easy , safe , common , normal , hard , difficult ,dangerous , unusual, rare , impossible , pleasant等。
在①中的形容词作表语可以用从句改写，It is important for her to come to the party. = It is important that she (should ) come to the party19. It is no good / use / fun doing sth.It is a great pleasure / a waste of time / a bore doing sth .It is useless / nice / good doing sth .该句型中的真正主语是动名词或动名词短语，主句中的表语可以是名词或形容词。