回答如下：
who引导的宾语从句在从句中可以作主语、宾语、表语。例如：
1、 I don't know who broke the vase.
2、 We cannot tell who he is.
3、 We know who he is waiting for.
4、 Do you know who she likes?
5、 I know who she wants to have go there.
回答如下：
who引导的宾语从句在从句中可以作主语、宾语、表语。例如：
1、 I don't know who broke the vase.
2、 We cannot tell who he is.
3、 We know who he is waiting for.
4、 Do you know who she likes?
5、 I know who she wants to have go there.
