表语从句

引导词: that whether who whom whose what which when where why how as if / as though

1. The truth is that he has never been to the countryside.

2. The question is whether w can finish the experiment by Friday.

3. It looks as if it were going to rain.

实际情况是他从未去过农村. that 一般不省略

问题在于我们能否在明天下午之前完成这项实验. 表语从句不用 if

4. This school is no longer what it was before.

这所学校已不再是从前的那个样子了. what =the thing that

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系动词后面