同学你好，该知识点来自沪江网校《英语零基础直达大学六级【8月班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
当由一般疑问句充当宾语从句时，用if或whether引导，意为“是否”。如：
I don't know if ／whether he still lives here after so many years．我不知道这么多年后他是否还住在这儿。

特殊疑问句的宾语从句引导词如下：

用连接代词引导。常见的引导宾语从句的连接代词有what, who, whom, which, whose等。此时要特别注意宾语从句用陈述句词序，而不用疑问句词序：
Ask him which he wants. 问他要哪一个。
She asked who would like to go. 她问谁愿意去。
Tell me whose wallet this is. 告诉我这是谁的钱包

用连接副词引导。常见的引导宾语从句的连接副词有when, how, where, why等。此时要特别注意宾语从句用陈述句词序，而不用疑问句词序：
He knows where they live. 他知道他们住哪里。
Tell us how you are getting on now. 告诉我们你现在过得怎样？
I can't tell you why she is crying. 我不能告诉你她为什么哭。
He didn't say when he would return. 他没有说什么时候回来。


再变成疑问句，只要做到以下步骤，以I don't know if he still lives here after so many years．为例

1. 去掉主句I don't know
2. 去掉引导词if
3. 剩下的句子变为疑问句语序：Does he still live here after so many years?

祝同学学习进步~