表语从句在复合句中作句子的表语，通常用在连系动词be，look，seem后。引导表语从句的连词有that，as if，as though，whether；连接代词who，what，which；连接副词when，where，how，why等。需要注意的是表语从句也要用陈述语序。

1. 从属连词that(一般不省略为好)，whether(不用if)，as if(though)等引导的表语从句。

☛The reason (why) she hasn't come is that (此处不可用because) she has to take her mother to a hospital. 她没来是因为她必须送母亲去医院。

2. 连接代词what, which, who, whom, whose等引导的表语从句。

☛This is what I want to say. 这就是我想说的。

3. 连接副词when, where, how, why等引导的表语从句。

☛This is how we overcome the difficulties. 这就是我们克服困难的方法。

☛The question is where we shall have the sports meeting. 问题是我们在哪里开运动会。

☛It looked as if he had lost something. 看起来他好像丢失了什么东西。

☛His trouble is how he can get the help he needs. 他的麻烦是如何得到所需要的帮助。

☛His car broke down on the way. That's why he is late. 他的车坏了，那就是他迟到的原因。

1. Do you know _____________?

　A. what time will the plane take off

　B. what time would the plane take off

　C. what time the plane will take off

　D. the plane will take off at what time

2. The manager came up to see _____________.

A. what was the matter

B. what the matter was

C. what the matter is

D. what's the matter

3. Nobody but Jim and his uncle _____________.

　A. know who is he B. know who he is

　C. knows who is he D. knows who he is

【答案】