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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.
it做形式主语和形式宾语的用法句型
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。
一般陈述句：Tom bought a book in this bookshop yesterday.
It is Tom who/that bought a book in this bookshop yesterday. 强调主语
It is a book that Tom bought in this bookshop yesterday. 强调宾语
It is in this bookshop that Tom bought a book yesterday. 强调地点状语
It is yesterday that Tom bought a book in this bookshop. 强调时间状语
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. 强调句
= Not until she took off her dark glasses did I realize she was a famous film star. 倒装句
= I didn't realize she was a famous film star until she took off her dark glasses. 一般句式
3. It is+形容词（clear /obvious/true/possible/certain…）+ that 从句 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+形容词（important /necessary/ right/strange/natural...）+that 从句(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 is necessary that we (should)learn a foreign language.
有形式宾语it的几个固定用法
固定用法如下：
1. 动词+it+宾语补足语+不定式。当不定式、动名词、从句等复杂成分用作宾语且后面跟有宾语补足语时，通常会在宾语补足语前使用it作形式宾语，而将真正的宾语移至句末。
2. 动词+it+that从句。
3. 动词+it+when/if从句。
4. 动词+prep.+it+that从句。
5. 动词+it+介词短语+that从句。
6. It+be+被强调部分+that/who+其他部分。这是强调句的基本结构。
例句：
1、It was a computer that he bought last week.
2、I took it for granted that he would help us.
3、We really appreciate it when she offered to help.
4、I find it difficult to do the job well.
5、I think it best that you should stay there.
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