表语从句归纳.doc

表语从句
表语从句放在系动词之后，充当复合句中的表语。
The question is who will do it.
系动词 表语从句
关联词
1. 可接表语从句的连系动词有be（is, am, are, was, were）, look, seem, sound, appear等。
China is no longer what she used to be.
今日的中国不再是过去的中国了。
The question remains whether they will be able to help us.
问题还是他们能否帮我们。
At that time, it seemed as if I couldn't think of the right word.
当时，我似乎怎么也想不出一个恰当的字眼来。
2. whether, as, as if / though引导的表语从句
He looked just as he had looked ten years before.
他看起来还与十年前一样。
It sounds as if someone is knocking at the door.
听起来好像有人在敲门
3. because, why引导的表语从句
That‘s because he didn’t understand me.
那是因为他没有理解我。(That's because...强调原因)
That's why he got angry with me.
那正是他对我生气的原因。　(That's why...强调结果)
4. who, whom, whose, what, which, whoever, whatever, whichever ，where, when, how, why等引导的表语从句。如：
The problem is who we can get to replace her.
问题是我们能找到谁去替换她呢。
The question is how he did it. 
问题是他是如何做此事的。
5.从属连词that。that在表语从句中不充当任何句子成分，也没有任何意义。不可省略
The trouble is that I have lost his address.  麻烦是我把他的地址丢了。