由连接代词引导的宾语从句

连接代词也可以引导宾语从句。连接代词在宾语从句中可作主语、宾语、表语、定语等。
1） 作主语
* Do you know who will come this afternoon? 你知道今天下午谁来吗？
* I do not know what causes the trouble. 我不知道是什么引起了麻烦。
* The editor decides which will be the most important story on the front page. 编辑决定哪篇报道最重要，安排在头版。

2） 作宾语
* Did you hear what she said? 你听见她说的话了吗？
* As a friend of yours, I want to tell you what I hear. 作为你的朋友，我想告诉你我听到的情况。
* I asked him whom they had chosen. 我问他，他们选了谁

3） 作表语
* Please tell me who that girl is. 请告诉我那个姑娘是谁。
* I don't know whose that is．我不知道那是谁的
* She had demanded to know whose the child was. 她要求知道这孩子是谁的。

4） 作定语
* Could you tell me which gate we have to go to? 请问我们得走哪个门？
* Have you decided what music you'd like us to play at the party? 你已决定你想让我们在聚会上演什么音乐了吗？
* You may take whichever book will interest you. 哪本书让你觉得有趣，你可以拿哪本。