引导词it的用法
1.作形式主语 为了避免头重脚轻，英语里面常常把it放在句子的开头，而把真正作为主语的动名词，不定式和句子放在句子的后面去。请看下面的例子： It’s wrong to tell a tie. It took me ten minutes to get to the station.
It’s no use getting there so early. It’s dangerous playing with fire. It doesn’t matter whether he will come or not.
It’s a pity I didn’t think of it earlier.It’s not yet known where he has gone.
2.作形式宾语, 当复合句中，不定式短语，动名词短语和名词性从句作宾语时，常常it用作形式宾语，而把真正的宾语放在宾语补足语之后。请看例句：He feel it his duty to help others.
The new medicine made it possible to treat this terrible disease. We thought it no use doing that.
Out teacher thinks it no good learning without practice. I think it important that we should ta
ke part in the discussion.
He soon made it clear why she hadn’t invited me to the party.
Wouldn’t it better if you made an appointment to see him at the office?
（三）it用于强调句型, 结构：It+动词be+被强调部分+who(whom)/that+其他部分 这个结构的一般疑问句形式为：被强调部分+who(whom)/that+其他部分
若是对特殊疑问词进行强调，其结构为: 特殊疑问词+be +it+that+其他部分
三教九流图Was it in London that this happened? When was it that he left Beijing for Shanghai?
How was it that you came here? He asked me that where it is that we will have the meeting.
Not----until----句型的强调结构为it is not until-----that-------,that 后面要用肯定形式
Eg. My father didn’t return until 11 o’clock last night.
It was not until 11 o’clock last night that my father returned.
I didn’t realize she was a famous film star until she took off her dark glasses.
(四) it的重要句型
1. It is clear ( obvious， true， possible， ) 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．．．）
2. It is important ( necessary， right， strange， ) that ...
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，建议记住该句型中的形容词。 未成年的主张
eg. It is important that we (should) learn English well. It is necessary that he (should) remember these words.
3. It is said (reported,learned,thought,believed,hoped,suggested,) that ...
上海 国企改革
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. It is reported that another earth satellite has been put into orbit.
4. It is suggested ( ordered /demanded/ ) that ...
该句型和上一个同属一个句型，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.
5. 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. 这种事竟然发生在你们班上，真是遗憾！
It is a pity that he is ill. 他生病了，真遗憾！
6. 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.
7. It is the first ( second ... ) time that ...
该句型要和上一个句型区别开来，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 替换．常译为＂是第一（二）．．．次．．．
It is the first time I have been here. = This is the first time I have been here.
8. 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.
9. 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．．．＂。岳城水库
It was 3 days before he went to Beijing. It will be not long before he finishes his job.
10. It happens (seems， looks， appears ) 该句型中it是形式主语，that 引导的是主
语从句，主句中的happen 非你莫属 王鑫， seem等词是不及物动词。 It happened ( so happened ) that he met his teacher in the street. 亿目碰巧．．.
It seems that he will be back in a few days. 看来．．．
11. It takes 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.
12. It is no good (use ) doing sth. 该句型中的真正主语是动名词短语，主句中的表语可以是no good ， ( not any good ) ， no use ， ( not any use )。 It is no good learning English without speaking English.
13. It doesn’t matter whether ( if ) ... 该句型中whether(if) 引导的从句是真正主语，该句型常译为 ＂不论（是否）．．．没关系．．．。 It doesn’t matter if they are old.
14. 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。
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