2016年12月英语六级语法：it常用句型20种

　　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 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 .....

　　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 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 ...

　　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 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.

　　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!

　　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.

　　9.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.