it的句型

It句型--高考重点

It 引导的句型虽不是高考的热点，但近三年全国各省市试题中经常出现，我们不能疏忽。考查的重点主要有三个方面：1.it引导的强调句型；2. it作形式主语或者形式宾语；3. it 和since、before、when等连用。为了提高同学们的应变能力，现对it引导的一些常见句型归纳和总结如下：

1。It + be + 时间+ since-clause

主句多用一般现在时，从句用一般过去时，如果表示过去的情况，主句用一般过去时，从句用过去完成时，或主句用过去完成时，从句用一般过去时。

It is three years since his father passed away . (从现在算起)It was 10 years since they married . (从过去算起)It had been fifteen years since she left Shanghai . (从过去算起)30 years has passed since we joined the Party . (从现在算起)

2. It + be + 时间+ before-clause

这句型中的时间一般为表示一段时间的词语(如：long years , months , weeks , days ,hours , minutes ) ，主句中的谓语动词用肯定式，意为"过多长时间才......"。主句的谓语动词是否定式时，意为"没过多长时间就......"、“不久就……”。主句的时态可用过去时was/wasn’t或将来时will be/won’t be；用was 时，before从句的动词用一般过去时；用will be 时，before 从句常用一般现在时。It was not long before she learned those poems by heart . 她没过多久就背会了那些诗歌。It was long before the police arrived .过了很久警察才来。It will be hours before he makes a decision . 要过好几个小时他才会作出决定。It will not be hours before meet again 要不了几个小时我们还会再见面的

----Did your manager phone you again the next day ?

----No, it was a fortnight before he gave me a second call . 没有，过了两周他才再次打电话

3. It + be + 时间+ when-clause

这句型中, it 指时间，而且表示时间的词语前没有介词(时间一般为具体时间)。主句中的谓语动词和从句中的谓语动词在时态上一般是一致的，主句是will be，when从句用一般现在时代替将来时。例如：It was already 8 o’clock when we got home .It w as the next morning when we finished our work .It will be midnight when they get there .

4. It + be + 被强调成份+ that/who-clause强调句型。It was two years ago that he made an important invention .(原句是：He made an important invention two years ago . )It was at 5 o’cl ock that he practiced playing the violin in the morning .(原句是：He practiced playing the violin at 5 o’clock in the morning . )比较：It was 5 o’clock when he started in the morning 定语从句

注意：It is/ was not until +被强调成份+that

I didn’t realize she was a famous film star until she took off her dark glasses .

=Not until she took off her dark glasses did I realize she was a famous film star .

=It was not until she took off her dark glasses that I realized she was a famous film star .

What is it that he asks for?他要的东西究竟是什么？

5. It + be + time/high time / about/really time + that从句虚拟语气结构

不管主句中用的是is 或was ，that从句都须用动词的过去式或should + 动词原型(但不及用过去式普通)，在time之前有时可加上high或about 以加强语气。It is time(that)we handed in our exercises .(= It is time that we should hand in our exercises .)It is high /about time (that ) she wrote a letter to her boyfriend

I think it’s really time that we should end our discussion.我想我们该结束这次讨论了

6. It / This / That +is +the first(second , third …) time + that从句

这句型表示截止到说话时为止的某人的一种经历，关键是注意time前有序数词，主句是is