强调原因状语

由because引导的原因状语从句或because of短语可以作为被强调的成分。例如：

It is because the book is so useful for my work that I have bought it.

It was because he was in great difficulty that I tried my best to help him.

I was because of the job that he had taken the flat.

但是，若从句由as或since引导，强调时则改为because，这是因为，because引导的原因从句表示的意义非常强烈，符合强调句的目的。例如：

As she got up late, she missed the first bus. 变为强调句：

It was because she got up late that she missed the bus.

强调方式状语

It was just as he ordered that I acted.

It was by herself that she completed all the work.

It was with a stick that I managed to beat the dog off.

强调目的状语

It was for fun that he played the part of a clown.　　

It is in order to serve the people better in the future that we should study hard now.

强调表语

在系动词be后的表语不能作为被强调的成分。例如：

不可以说：It is a teacher that he is.

但可以说：It is a teacher that he has become.

强调宾语补足语

It was chairman that they elected him.

It was white that they painted the door.

（三）强调句的疑问句式、感叹句式和否定句式

强调句除了有陈述句式外，还有一般疑问句式、特殊疑问句式、感叹句式和否定句式几种类型。

强调句的一般疑问句式

直接把is或was提到it之前，强调句的一般疑问句是Is (Was) it+被强调部分+that+句子的其他成分。例如：

Was it Tom that found your pen in the classroom yesterday?

Was it in 1939 that the Second World War broke out?

Is it from advertising that a newspaper earns a lot of its profits?

Was it not until 12 o’clock that he went to bed?

It was Mike that sent the old man to the hospital, wasn’t it?

强调句的特殊疑问句式

疑问词+ is (was) it + that +句子的其他成分，特殊疑问词即是被强调的成分。例如：

Who was it that found your pen in the classroom yesterday?

When was it that the Second World War broke out?

Where was it that you lost your cell phone?

How was it that he managed to get my address?

How long ago was it that you last saw her?

What was it that had made you so sad?　　

Why was it that silver was not widely used as conductor?　　

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