1、It is + 被强调部分 + that ...
It was about 600 years ago that the first clock with a face and an hour hand was made.
It was they that (who) cleaned the classroom yesterday.
It was in the street that I met her father.
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 ...
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 ...
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。
It is important that we ( should ) learn English well.
It is necessary that he ( should ) remember these words.
5、It is said ( reported, learned ... ) that ...
It is said that he has come to Beijing.
It is reported that another earth satellite has been put into orbit.
6、It is suggested ( ordered ... ) 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.
7、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.
It is a pity that he is ill.
8、It is time ( about time, high time ) that ...
It is time that children should go to bed.
= It is time that children went to bed.
9、It is the first ( second ... ) time that ...
It is the first time I have been here.
= This is the first time I have been here.
10、It is ... since ...
It is ( has been ) 5 years since his father died.
11、It is ... when ...
It was 5 o’clock when he came here.
12、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...”。
It was 3 days before he went to Beijing.
It will be not long before he finishes his job.
13、It happens ( seems, looks, appears ) that ...
该句型中it是形式主语，that引导的是主语从句，主句中的happen , seem等词是不及物动词。
It happened ( so happened ) that he met his teacher in the street. （碰巧）
It seems that he will be back in a few days. （看来）
14、It takes sb. ... to do sth.
It took thousands of people many years to build the Great Wall.
15、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.
16、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.
17、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。常见的有： bad, brave, careless, clever, cruel, foolish, good（好心的）, honest, horrible, kind, lazy, modest , naughty, nice（有教养的）, polite, rude, silly, stupid, wise, wrong（错误的）等。 这个句型可以改写为：sb. is kind to do sth.
It is kind of you to say so.
= You are kind to say so.
18、It is necessary ( for sb. ) to do sth.
①important, necessary, natural
②easy, safe, common, normal, hard, difficult, dangerous, unusual, rare, impossible, pleasant等。
It is important for her to come to the party.
= It is important that she ( should ) come to the party.
19、It looks ( seems ) as if ...
It looks as if he is ill.（真的病了）
It looks as if he were ill.（没有生病）
It seemed as if he were dying.
20、We think it important to learn a foreign language.
“6”指主句中常用的动词：think, believe, make, find, consider, feel；
We think it our duty to clean our classroom every day.
He felt it important learning English well.
They found it difficult that they would finish their work in two days.