It做形式主语句型整理大全资料讲解

it做形式主语时的用法

it做形式主语时的用法It作为形式主语时，常常用于代替后面真实主语的从句、动名词或不定式，以避免句子结构显得过于复杂或者不平衡。

以下是It 作为形式主语的几种常见用法：1、It + be + 形容词 + that从句：这种句型中的形容词通常是表示性格、品质的形容词，如nice、kind、stupid等。

例如：It is kind of you to help me. 你真好，帮了我。

2、It + be + 名词 + that从句：这种句型中的名词通常是表示时间、距离、度量衡等概念的名词。

例如：It is five years since we last met. 我们上次见面已经五年了。

3、It + be + 介词短语/副词 + that从句：这种句型中的介词短语或副词通常用来描述地点、方式等。

例如：It is in this room that we had the party. 我们就是在这个房间里开派对的。

4、It + be + 动词的过去分词 + that从句：这种句型中的动词过去分词通常是表示完成的动词，如known、heard、seen等。

例如：It is said that he has gone abroad. 据说他已经出国了。

5、It + be + 不定式短语/动名词 + that从句：这种句型中的不定式短语或动名词通常用来描述将来的动作或一般性的情况。

例如：It is to study hard that he will succeed. 他只有努力学习才会成功。

需要注意的是，在It作为形式主语的句子中，真正的主语通常是一个从句或非谓语动词短语，这些从句或短语被放在句子的后面，以保持句子的平衡和流畅。

(完整版)it做形式主语用法大全含练习及问题详解

It作形式主语常见句型动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用it作形式主语，放到句首，常见句型有：1. It + be + 形容词+主语从句，如：It is uncertain whether he can come to Jenny’s birthday party or not.2. It + be + 名词词组+ 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question 等，如：It’s a pity that you missed the exciting football match.It remains a question whether he will come or not.3. It + be + 过去分词+ 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等，如：It is reported that 16 people were killed in the earthquake.It is not decided who will give the operation to the patient.4. It + 不及物动词(seem, appear, happen等) + 主语从句, 这类不及物动词有：appear, happen, seem等，如：It seemed that he didn’t tell the truth.It happened that I was out when he called.5. It + be + 形容词+ for sb.）+ 动词不定式这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for sb，如：It’s necessary for the young to master two foreign language.It is unwise to give the children whatever they want.这类形容词有：easy, difficult, hard, important, possible，wise6. It + be + 形容词+ of sb. + 动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。

初中英语“it”作为形式主语考点总结大全（共6页,很好!!!）

初中英语“it”作为形式主语考点总结大全（共6页,很好）
1、It’s +形容词/名词+（for sb. / sth）+to do sth
可以用于这类句型的形容词和名词以及例句如下：
2、It’s +形容词+of sb. +to do sth
这个句型是同学们最容易丢分的，大家需要知道在这个句型中，形容词是描述人的品德、特征。

同学们看一下能用于这个句型的形容词和例句：
3、It’s +形容词/名词+doing sth
在这个句型中，常见的形容词和名词有：no /little use, no /much good, useless 等。

例如：
It is no use crying over spilt milk.
It is no good talking about other’s faults.
4、It’s +形容词+that…
能用于这个句型的形容词有：possible, important, impossible, necessary, strange, natural, surprising, obvious, true, likely, unusual等。

除了true, likely, obvious这三个词外，其他的词后面that从句一般要用虚拟语气，（should+动词原形）should可以省略。

大家看下面例句：
5、It’s +名词+that…
在这个句型中，常用的名词有：fact, honor, belief, good thing / news, （no）wonder, no doubt, pity, shame等。

如例句1。

it用法大全形式宾语形式主语

2.非人称代词it
it有时并不指详细旳东西，而泛指天气、时间、环境等，称为非人称旳it： 2.1.指天气： It is a lovely day, isn’t it? It is a bit windy.
2.2.指时间: It was nearly midnight when she came back.
用It作形式主语旳句型： (1) It is adj.＋ to do sth. It is difficult to translate this article.翻译这篇文章极难。
(2) It is adj. ＋ for/of sb.＋ to do sth. It is important for us to learn English.学习英语对我们很主要。
㈠ 1.it作人称代词
1.1.it旳最基本使用方法是作人称代词，主要指刚提到旳事物，以防止反复:
Ningbo is a beautiful city, isn’t it?
1.2.也能够指动物或婴儿(未知性别旳婴儿或孩子): Is this your dog？No, it isn’t.
1.3.也可指抽象事物: It was a great surprise to me when he did a thing like that．
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.
= He is said to have come to Beijing.
②不论被强调部分是哪种状语，只能用 that连接，不得使用where、when等连词.

it作形式主语的句型

it作形式主语的句型
1、It + be + 形容词 + that从句：表示某事物具有某个特征或属性。

例如：It is important that we arrive on time.（我们按时到达很重要。

）
2、It + be + 名词短语 + that从句：表示某个事物符合某个特征或属性。

例如：It is a shame that he didn’t come to the party.（他没来参加聚会真是遗憾。

）
3、It + be + 过去分词 + that从句：表示某个动作已经被完成或已经发生。

例如：It is said that the book will be published next month.（据说这本书将在下个月出版。

）
4、It + be + 现在分词 + that从句：表示某个动作正在进行或正在发生。

例如：It is raining hard outside.（外面正下着大雨。

）
5、It + be + 不定式短语 + that从句：表示某个动作将要发生或被计划。

例如：It is to be announced tomorrow if the meeting will be held as scheduled.（明天将宣布会议是否按计划举行。

）
这些句型中的“it”通常被称为“形式主语”，因为它在句子中充当主语，但实际上并不是真正的主语。

这种用法是为了使句子更加通顺或强调某种特定的信息。

it形式主语句型

一. It+be动词+过去分词+that从句It's reported that ...据报道...It is generally thought that...人们普遍认为It has been found that...现已发现...It's believed that...据信...It should be noted that...应当注意...It must be pointed out that...必须指出...say/expect/know/estimate/forecast二. It+be动词+形容词+that从句It is clear that...显然...It is likely that...很可能...It is certain that...可以相信...It is fortunate that...幸运的是...It is possible that...很可能...It is natural that...很自然...It is strange that...奇怪的是...It is necessary that...有必要...三. It+be动词+名词短语+that从句It is a pity that...可惜的是...It is good news that...真是太好了...It is no wonder that...难怪...It is a fact that...事实是...It is agood thing that...真是件好事...It is a shame that...遗憾的是.../...真是太不像话了It is an honor that...真荣幸...It is my belief that...我相信...It is common knowledge.. ....是常识It is a miracle that... ...真是奇迹四. It+不及物动词+that从句It seems that...似乎...It happens that...碰巧...It comes about that...结果是...It follows that...因此.../由此可见...It turns out that... 结果证明是...五. 其他结构It draws upon/on sb that......某人突然想起It makes no difference that... ...无所谓It is of little consequence that... ...无关紧要It occurs to sb that... 某人突然想起It doesn't need to be bothered that...不必担忧...。

It做形式主语讲解

④It + be +-ed（过去分词）+ that-从句
It is said that…
It is reported that… It is supposed that… It is hoped that…
据说…
据报道… 据推测… 希望…
It is well known that… 众所周知… It is generally considered that…普遍认为 …
It’s necessary for us to master a foreign language.
• ②It +be+ adj.+ of sb. to do sth
•
此处adj. 通常为描述人的形容词：kind，nice，rude， cruel，careless，foolish，stupid，wise，crazy…某人做某事，某人是… It’s very kind of you to help me with my English.
It is suggested that… 有人建议…
练习：把下列格局转换为it做形式主语的句子
1.He was rude to say so.
It was rude of him to say so.
2.Trying again is of use. It is of use trying again. 3.When and where to hold the party hasn’t been decided. It hasn’t been decided when and where to hold the party.
• eg. It’s foolish of you to drive a car after drinking. •

It的用法及句型总结

It的用法及句型总结"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，现将it用法归纳如下：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 on e'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/conc ern/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。

高中英语课件-it作形式主语及形式宾语句型

like/dislike/love/enjoy/hate/appreciate +it when…
I would appreciate +it +if… 注意：表好恶的动词不能直接接宾语从句，
需要在从句前加上形式宾语it。
ห้องสมุดไป่ตู้
it的固定用法
When it comes to.... 当谈到…；
take it for granted that... 认为…理所当然
It is a fact(a pity, a shame, an honour，no wonder) +that从句注：It is no good (use ) doing sth.(动名词短语做真正主语)
做某事是没益处(没有用的)的
注：区分常见的there be固定句型
There is no doubt that 毫无疑问 There is no need to do 没有必要 There is no point doing sth 做某事无意义
depend on it that...某人相信...
see to it that... 务必，保证
Let it be/go.
顺其自然；
That’s it. Make it. Get it.
对了，正是；成功了；懂了
一. it 用作形式主语 (1) It is+ adj. + that从句/to do sth
① It is clear, obvious,true,possible,certain.... that .....
“....是清楚（显然，真的，肯定）的” ② It is necessary, important, strange, natural.... that .....

it做形式主语的19个句型

1.It is/was + 被强调部分 + that/who ...之巴公井开创作该句型是强调句型。

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，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。

2. It is 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/cer tain… 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……）”是主语从句最罕见的一种结构。

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 ...+(should) do该句型和上一个同属一个句型。

“It”用法及其句型和固定搭配讲解

“It”用法及其句型和固定搭配讲解“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，现将it用法归纳如下:一、It用作实词表达以下概念：指代前文提到的事物，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.2。

it做形式主语的19个句型

1.It is/was +被强调部分+ that/who ...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，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。

2. It is 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 glassesthat 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 staruntil 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 atree.=That he's round and tall like a tree is veryclear.4.It is important /necessary/right/strange/natural... that ...+(should) do该句型和上一个同属一个句型。

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形式主语句型

“it”在英语中经常用作形式主语，尤其是在主语从句中。

形式主语用于表示主语从句，即一个句子作为主语，而“it”是这个句子的形式主语。

以下是几个使用“it”作为形式主语的常见句型：
1. It is + 形容词+ that + 主语从句
例如：It is clear that he has made a mistake.
解释：在这个句型中，“it”是形式主语，“that”后的句子是真正的主语。

2. It is + 名词+ that + 主语从句
例如：It is a fact that the earth is round.
解释：这个句型与上一个相似，但形容词被替换为名词。

3. It + 动词+ 主语从句
例如：It happened that he was late for the meeting.
解释：在这个句型中，“it”是形式主语，动词是主语从句的谓语。

4. It + be + 时间/距离+ before + 主语从句
例如：It will be two years before we meet again.
解释：这个句型用于表示在某个时间或距离之后会发生某事。

5. It is/was + 被强调部分+ that + 主语从句
例如：It was yesterday that he met his friend.
解释：这个句型用于强调某个时间或部分。

这些只是使用“it”作为形式主语的一些常见句型。

在英语中，还有其他更复杂或特定的用法。

It做形式主语句型整理大全

It做形式主语句型整理大全It 做形式主语句型整理大全形式主语句型是英语语法中常见的一种句型结构，其中“it”作为句子的形式主语，代替真正的主语，使得句子结构更加简洁和清晰。

本文将介绍常见的形式主语句型，并给出相应的例句说明。

1. It + be + 形容词 + (for/of somebody) + to do something这种句型用来描述某事或某物对某人具有某种特定属性或特征，强调主观情感或感受。

其中的“for/of somebody”是可选的，用来表示某人对这种特征的感受或看法。

例句：- It is important for us to take care of the environment.- It is easy to learn a new language if you practice every day.- It is common for teenagers to experience mood swings.2. It + be + 名词 + (for somebody) + to do something这种句型用来描述某事或某物对某人来说是合适或适当的。

例句：- It is a good idea for you to start exercising regularly.- It is essential for a student to manage their time effectively.- It is necessary for parents to spend quality time with their children.3. It + be + 形容词 + that + 句子这种句型用来描述某事或某物具有某种特定属性或特征，强调客观事实和真实性。

例句：- It is interesting that she decided to travel alone.- It is evident that the company is facing financial difficulties.- It is amazing that they managed to finish the project ahead of schedule.4. It + be + 名词 + that + 句子这种句型用来描述某人对某种情况或事实所持的看法、判断或观点。

It的用法及句型总结

It的用法及句型总结"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，现将it用法归纳如下：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 on e'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/conc ern/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。

it形式主语19个句型

1.It is/was + 被强调部分+ that/who ...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，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。

2. It is 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 ...+(should) do 该句型和上一个同属一个句型。

it作形主语的五种

it作形主语的五种IT 作为形式主语的五种情况如下：1. 结构：It + be/have/do + 名词/代词+ 形容词/副词/动词-ing/动词过去分词等形式。

例子：-It is said that he is going to join our team.（据说他将要加入我们的团队。

）-It has been raining since morning.（自从早上就一直下雨。

）2. 结构：It + 动词过去分词+ 名词/代词+ 形容词/副词等形式。

例子：-It seemed like a good idea at the time.（当时看来这是一个好主意。

）-It occurred to me that we had met before.（我想起来我们之前见过面。

）3. 结构：It + 动词-ing + 名词/代词+ 介词+ 宾语等形式。

例子：-It's interesting to learn about different cultures.（了解不同的文化很有趣。

）-It's important to keep the environment clean.（保持环境整洁很重要。

）4. 结构：It + 动词-ing/动词过去分词+ 副词等形式。

例子：-It's been a long time since we last met.（自从我们上次见面已经过去很长时间了。

）-It doesn't matter if he doesn't know.（他不了解没关系。

）5. 结构：It + 动词-ing/动词过去分词+ 宾语等形式。

例子：-It happened that I knew the person involved.（碰巧我知道涉及的那个人。

）-It occurred to me that I hadleft my wallet at home.（我想起来我把钱包忘在家里了。

It构成的句型小结

It构成的句型小结一、It作形式主语的句型为使句子平衡，往往把it置于句首作形式主语，而把真正的主语（通常是不定式短语、动名词短语或主语从句）移至句末。

It 作形式主语的句型有：㈠it 代指不定式短语的句型1. It takes + (sb.) + sometime / some money + to do sth.做某事花去某人多长时间Just a minute, it won't take me long to change. 等一下,我很快就可以换好衣服。

It takes five minutes to walk there. 走到那里需要5分钟。

It took me three days to prepare for the examination. 我花了三天准备那次考试。

It takes a lot of money to buy a house like that. 买那样一幢房子需要很多钱。

2.It takes + 名词+ (for sb.) to do sth. 某人做某事需要… …It took great imagination as well as patience for Annie to teach me to speak.对安妮来说，教我说话需要极大的信心和想象力。

It takes time for them to prepare for the great changes that take place in space.他们需要很多时间准备应付太空中所发生的巨大变化。

3.It is + 形容词+ (for / of sb.) to do sth. 某人做某事是… …的for sb. 的句型常用于表示事物的特征特点，表示客观形式的形容词，如easy, difficult, hard, important, possible, impossible, comfortable, necessary, better等。