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形式主语it的5种用法是什么
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it的5种用法
1、指代性it一般是指人称代词it，it作人称代词时可指代事物、动物、婴儿、未知的人或一件事。
2、不定式作主语，It's my pleasure (to help you).
3、it做先行词。
4、it做形式宾语。
5、引导强调句的it。
it做形式主语基本句型
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，wise
形式主语it的5种用法
一、形式主语it的5种用法是一下
1.指代性it一般是指人称代词it,it作人称代词时可指代事物、动物、婴儿、未知的人或一件事。
2.不定式作主语,It's my pleasure (to help you).
3.it做先行词。
4.it做形式宾语。
5.引导强调句的it。
（1）it做形式主语基本句型：It+be+形容词+主语从句，
（2）It+be+名词词组+主语从句
（3）It+be+过去分词+主语从句
it作形式宾语
it作形式宾语
" It" 做形式宾语用法总结
当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时，为保持句子结构平衡，避免句式结构的混乱，常用it作形式宾语，而将真正的宾语放在句尾，构成“动词＋it＋宾语补足语＋不定式（动名词或从句）”结构，也可称作“6123结构”。此时it仍只起先行引导作用，本身无词义。它可以代替三种形式：不定式、动名词和宾语从句。
it作形式宾语时，需具备两个条件： ① 真正的宾语是不定式、动名词或从句; ② 有宾语补足语，具备了这两个条件，形式宾语it一定要用。
⒈ it代替不定式短语 think/ find/ feel/ consider/ make/ regard…+ it +形容词/名词 + 不定式短语 如：
①I find it pleasant to work with him.
(it 作形式宾语，代替不定式短语to work with him)
②They felt it difficult to finish the work in such a short time.
（ it 作形式宾语，代替不定式短语to finish the work in such a short time）
③She thinks it her duty to help us.
（ it 作形式宾语，代替不定式短语to help us）
④I think it my honor to be invited to speak here.
（ it 作形式宾语，代替不定式短语to be invited to speak here）
⑤Tom didn’t find it difficult to write letters in Chinese.
（ it 作形式宾语，代替不定式短语to write letters in Chinese）
⑥All these noises made it impossible for me to go on with the work.
（ it 作形式宾语，代替不定式短语to go on with the work）
⒉ it代替动名词短语( 这只限于少数句型，在多数情况下用不定式时更多一些)
如：
①The professor considers it no good reading without understanding.
②Do you consider it any good trying again?
③He found it useless( no use) arguing with him.
④He thought it absolutely senseless attempting the impossible.
⑤I don’t think it worthwhile going to such a place.
⒊ it代替宾语从句：
如：
①We all thought it a pity that the conference should have been cancelled.
②I took it for granted that they were not coming.
③I’ll see to it that everything is ready in time.
“it”的特殊用法常出现在以下几种结构中。
A. 动词＋it＋when / if 从句。常见于appreciate, enjoy, like, dislike, love, hate, prefer等少数动词之后。
We would much appreciate it if you could do us that favour.
I'd prefer it if I didn't have to finish the work.
B. 动词+ it + that从句。常见于like, take, have, put等少数动词之后（it相当于that从句的同位语）。
I take it that they will succeed sooner or later.
The newspapers have it that some Japanese firms have gone bankrupt.
Rumor has it that Mary is getting married.
I take it that you have been out.
Let me come and stay. You can put it that it was arranged before.
C. 动词 + it + 介词短语 + that从句。常见于bring it to one's attention; owe it to sb; take it for granted 等结构中。
I owe it to you that I finished my work in time.
Don't take it for granted that they will support you.
D. 动词 + 介词(短语) + it + that从句。常见于answer for, depend on, rely on, insist on, look to, see to, stick to 等结构中。
I'll see to it that everything is ready in time.
You may depend on it that Tom will help you with your English.
I’m counting on it that you will come.
E. 动词+ it +过去分词+从句。常见于几个可以带过去分词作宾语补足语的动词之后。
I heard it said that that factory was founded in 1995.
They haven't made it known where the meeting is to take place.
it作形式宾语的5种类型是哪5种例句
It 用作形式宾语
当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时,为保持句子结构平衡,避免句式结构的混乱,常用it作形式宾语,而将真正的宾语放在句尾.此时it仍只起先行引导作用,本身无词义.
下列四种情况须用it 作形式宾语：
① 当不定式（短语）、动名词（短语）或从句在复合宾语结构中作某些动词的宾语时（如think,make,find,consider,feel,suppose等）；
e.g.They found it pleasant that they worked with us Chinese.
（他们发现与我们中国人一起工作很愉快.）
I don’t feel it difficult to understand the Special English.
（我觉得理解英语特别节目并不难.）
He makes it a rule never to borrow money.
（他立志决不向别人借钱.）
I think it no need talking about it with them.
（我认为没必要跟他们谈.）
② 某些表示“喜、怒、哀、乐”的动词,如like,enjoy,love,hate等,往往不能直接接宾语从句；
e.g.I don’t like it that he’s so lazy.
（我不喜欢他那么懒惰.）
I hate it when my mother asks me to eat eggs.
（我讨厌母亲要我吃鸡蛋.）
③ that引导的宾语从句不能直接作介词的宾语；
e.g.You may depend on it that we shall always help you.
（尽管放心,我们会随时帮你的.）
Would you see to it that she gets home early?
（你负责保证她早到家,好吗?）
He insisted on it that he was innocent.
（他坚持说自己是无辜的.）
④ 由及物动词与介词组成的固定搭配中,宾语从句若作该动词的宾语时,须借用it.
e.g.I leave it to your own judgment whether you should do it.
（我让你自己判断这事是否该做.）
We owe it to you that there wasn’t a serious accident.
（多亏了你才没有发生严重事故.）
“it”作形式宾语时的几种特殊结构
英语中,当动词不定式、动名词或从句在句中充当宾语且其后又带有宾语补足语时,习惯上要在宾语补足语前使用一个没有具体意义的形式宾语it,而将真正的宾语移到补足语的后面,构成“动词＋it＋宾语补足语＋不定式（动名词或从句）”结构.如：She felt it her duty to take good care of them.
她感到好好照顾他们是她的责任.
I think it no good going there now.
我认为现在去那里没有好处.
The headmaster has made it clear that the school meeting will not be put off.
校长说得很清楚校会不会推迟.
但我们常会碰到it用作形式宾语时之后没有形容词或名词作宾语补足语的情况,这一点在近几年高考试题中经常涉及,需引起同学们的注意.
I hate_____ when people talk with their mouths full.(NMET 1998)
A.it B.that C.these D.them (答案为:A)
我讨厌人们一边吃饭一边说话.
I like _____ in the autumn when the weather is clear and bright.(全国卷 2004)
A.this B.that C.it D.one (答案为:C)
我喜欢秋天晴朗的天气.
以上这两道高考题中,it用作形式宾语,它的真正的宾语则是由when引导的从句.“it”的这种特殊用法常出现在以下几种结构中.
A.动词＋it＋when / if 从句.常见于appreciate,enjoy,like,dislike,love,hate,prefer等少数动词之后.
We would much appreciate it if you could do us that favour.
要是你们能帮我们这个忙,我们将非常感激.
I'd prefer it if I didn't have to finish the work.
要是我不必完成那项工作,那就太好了.
B.动词+ it + that从句.常见于like,take,have,put等少数动词之后（it相当于that从句的同位语）.
I take it that they will succeed sooner or later.
我认为他们迟早会成功的.
The newspapers have it that some Japanese firms have gone bankrupt.
报上说一些日本商号破产了.
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