BBC news 2010-03-19 加文本

why表语从句

引导表语从句的词有连词that, whether，连接代词和连接副词，关系代词型what，以及as if, as though, because等连词。

1)由that引导

The fact is that he doesn’t really try. 事实是他没有做真正的努力。

2)由whether引导

The question is whether the film is worth seeing. 问题是这部电影是否值得看。

【注意】whether 可引导表语从句，但与之同义的if却通常不用于引导表语从句。

3)由连接代词引导

You are not who I thought you were. 你已不是我过去所想像的人。

The problem is who we can get to replace her. 问题是我们能找到谁去替换她呢。

4)由连接副词引导

That was when I was fifteen. 这是我15岁时发生的事。

That’s where I first met her. 那就是我第一次遇见她的地方。

That’s why he didn’t come. 这就是他没有来的缘故。

5)由as if / as though引导

It isn’t as if you were going away for ever. 又不是你离开不回来了。

Now it was as though she had known Millie for years. 现在好像她认识米莉已有好多年了似的。

It is not as though we were poor. 又不是我们家里穷。

6)由because引导

It is because I love you too much. 那是因为我太爱你了。