此外，情态动词还可用于It be中：

It might have been John that bought a new book for Mary yesterday.

It may be next week that she leaves for Tokyo.

It mast have been a thief that broke in the house.

It can’t be Tom that has damaged the desk.

It will not be you that will have to take the blame for this.

that和who有时可以省略

随着语言的发展，这种强调句型中的that或who有时可以省略。例如：

It was my brother (that/who) you saw the other day.

It was William (who) did it.

It was a letter (that) came this morning.

复杂强调句

被强调部分是主语从句：

It is what he said that I have failed to recall.

It is not who is right but what is right that is of importance.

It is what you do rather than what you say that matters.

被强调部分含定语从句：

It is always the mouth which talks too much that arouses troubles.

It is only a man who has seen much of the world that can be a leader.

Was it in the village where we used to live that the accident happened?

It was in the small house which was built of stones by his father that he spent his childhood.

被强调部分含同位语从句：

It was the news that our class won the match that made us excited.

It is the problem whether they should join the club that we are going to discuss.

强调句是宾语从句：

David said that it was because of his strong interest in literature that he chose the course.

I can’t remember how many days ago it was that a fight broke out between the husband and wife.

I’ve already forgotten where it was that you put the dictionary.

I wonder whether it was because he had failed in the examination that he was so unhappy.

强调句是主语从句：

It doesn’t matter who it is that I’m talking to.

What it is that we are going to do next has not been decided.

让步强调句

另外，还要注意一种貌似强调句的“It is … that … ”句式，这是英语中比较少见的特殊让步句，要“反译”它的句子意思才行。例如:

It is a wise father that knows his own child. ——Shakespeare 再英明的父亲也不一定了解他自己的孩子。——莎士比亚

It is a good horse that never stumbles. 好马也会失蹄。

It is a long lane that has no turning. 无论怎样长的巷子也会有转弯的地方。

It is a wise man that never makes mistakes. 再聪明的人也会犯错误。

It is a good wife that never grumbles. 再好的妻子也会唠叨。

It is a good machine that works without power. 再好的机器没有动力也不能工作。

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