考点4 表语从句

表语从句在句中作表语，位于主句中的系动词之后。除that, whether和疑问词外，as if, as though, because也可引导表语从句。

The question is whether she can speak English. 问题在于她是否会说英语。

That is what we need. 那正是我们所需要的。

It looked as if it was going to rain. 似乎要下雨了。

注意

① why与because 均可引导表语从句，但前者强调结果，后者强调原因。

I had a cold. That’s why I didn’t come. 我感冒了，所以我没有来。

I didn’t come. That’s because I had a cold. 我没有来，因为我感冒了。

② 主句的主语是reason时，表语从句要用that，不能用because。

The reason why we didn’t go was that we were notified too late.

我们没有去的原因是我们得到通知太晚了。