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。

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）
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。

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。

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。