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1、1. It is + 被强调部分 + that .该句型是强调句型。将被强调的部分放在前面，其它部分置于that之后。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。 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
2、 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.=
3、I didnt realize she was a famous film star until she took off her dark glasses. 3. It is clear ( obvious, true, possible, certain.) 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）是主语从句最常见的一种结构。It is very clear that hes round and tall like a tree.= That hes round and tall like a tree is very cl
4、ear. 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 .
5、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. 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 suggeste
6、d 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. 这种事竟然发生在你们班上，真是遗憾！ It
7、is a pity that he is ill. 他生病了，真遗憾！ 8. 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 常用过去时态表示虚拟 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. 9. It is the first ( second . ) time that .该句型要和上一个句型区别
8、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. 10. 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，sin
9、ce 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. 11. It is . when .该句型中的 when 引导的是一个时间状语从句，主句中的 it 指时间，表语由具体的时间充当。常译为当的时候，是。It was 5 oclock 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
10、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 wil
11、l be back in a few days. 看来 14. 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. 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 learn
12、ing English without speaking English. 16. It doesnt 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 doesnt 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
13、 , 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.该句型与上一个同属一个句型。如果不定式的逻辑主语是由for引起，主句中的形容词
14、通常是表示重要性，紧迫性，频繁程度，难易，安全等情况的形容词。常见的形容词有： important, necessary, natural easy , safe , common , normal , hard , difficult , dangerous , unusual, rare , impossible , pleasant等。在中的形容词作表语可以用从句改写，如：It is important for her to come to the party. = It is important that she (should ) come to the party19. It looks ( seems ) as if .该句型中it无意义。 as if 引导一个状语从句。常译为，看起来好象如果与事实不相符合，则用虚拟语气 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.该句型中的it 作形式宾语。为了记忆方便我们可称该句型为“6123结构”。6 指主句中常用的动词：think, believe, mak
