表语从句
表语从句就是用一个句子作为表语。
* 表语与表语从句
His suggestion is good.
His suggestion is that we should stay calm.
表语从句的连词
可接表语从句的系动词有be，look，seem，remain, sound，appear等。
China is no longer what she used to be.
The question remains whether they will be able to help us.
It sounds as if someone is knocking at the door.
1、连词that（不可省略），whether，as，as if/though引导的表语从句。
My opinion is that we start early tomorrow.
The question is whether it is worth doing.
The situation is not as it seems to be.
She looks as if she is worried about her father"s disease.
注意：whether引导表语从句，表示是否，但if不能引导表语从句。
What the doctor really doubts is whether my mother will recover from the serious disease soon. （此处whether不能改成if）
2、连接代词who，whose，what，which引导的表语从句。
The problem is who can we get to replace her.
The question is whose shirt this is.
He has become what he wanted to be ten years ago.
The question is which color he will choose.
3、连接副词 where，when，how，why引导的表语从句。
That"s where I can"t agree with you.
The question is when he can arrive at the hotel.
This is how we overcome the difficulties.
That was why Wendy was late for the meeting.
注意：reason做主语时，表语从句要用that引导，而不能用because引导。
The reason why she was late is that she missed the bus this morning.
表语从句的语序
表语从句的语序用陈述语序
The question is when he can arrive at the hotel.
The question is whether the enemy is marching towards us.
The reason why we don"t trust him is that he has lied to many people.
表语从句的时态
表语从句中主句时态和从句时态可以不一致。
The question is why he cried yesterday.
The question is who will travel with me to Beijing tomorrow.
His problem is that he is having a tough relationship with his family.
表语从句的注意事项
1. 表语从句中的连词that不可以省略；
2. if不可以用来引导表语从句；
3. 主句为reason时，表语从句不可以用because，而要用that；
4. 表语从句的语序用陈述句语序；
5. 标语从句的主句和从句时态可以不一致。
表语从句练习题
选择正确的选项。
1. What I want to know is ______ he likes the gift given by us.
A. if
B. that
C. whether
D. 不填
正确答案：C
2. Go and get your coat, it"s ______ you left it.
A. where
B. there
C. there where
D. where there
正确答案：A
3. The reason why he failed is ______ he was too careless.
A. because
B. that
C. for
D. because of.
正确答案：B
4. Einstein"s most famous theory is ______ we call the theory of relativity.
A.what
B.where
C.that
D.why.
正确答案：A
5. ______ I can"t understand is ______ he changed his mind.
A. that, that
B. which, how
C. that, why
D. what, why
正确答案：D
