等和连接副词where, when, how, why。注意表示"是否"时，只用whether，不用if。而以The reason作主语，构成"The reason be+表语从句"时，只能用that来引导表语从句。

【跟踪练习】

I. 用适当的连词填空。

1. Catherine said 　　　　 she had never been to Guangzhou.

2. This is 　　　　 we should do.

3. I don't know 　　　　 they have passed the exam.

4. His first question was 　　　　 Mr Smith had arrived yet.

5. What the police want to know is 　　　　 you entered the room.

6. Linda said 　　　　 she met her old friend yesterday by accident.

7. I can make more money, you know. That's 　　　　 I want you to work there.

8. I hardly understand 　　　　 he has told me.

9. - Do you remember 　　　　 he came?

　- Yes, I do. He came by car.

10. Someone is ringing the doorbell. Go and see 　　　　 it is.

11. Little Tommy was unwilling to tell the schoolmaster 　　　　 he had done the day before.

12. What the doctors really doubt is 　　　　 my mother will recover from the serious disease soon.

II. 翻译句子。

1. 他说晚上有一个会议。

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2. 班长总是乐于帮助任何需要他帮助的人。

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3. 我不知道今天早晨珍妮为什么迟到。

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4. 你头疼得厉害，那是因为你太累了。

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5. 约翰说他星期三要去伦敦。

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