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英语中，疑问词不仅可以用于构造疑问句，还可以用于引导宾语从句。在宾语从句中，疑问词用来引导从句，起到连接作用，同时还可以起到限定和强调作用。
常见的疑问词有：what, who, whom, whose, which, when, where, why, how等。下面分别介绍它们在宾语从句中的使用方法：
what
what通常用来询问事物或物品，也可以用来引导宾语从句，如：
- I don't know what he wants to do.
- Please tell me what you think about this idea.
who/whom
who/whom通常用来询问人的身份或者名字，也可以用来引导宾语从句，如：
- I don't know who/whom you are talking about.
- Can you tell me who/whom will attend the meeting?
注意：在口语中，who和whom的用法经常混淆，但在正式写作中，应该严格区分。
whose
whose通常用来询问物品或者人的所有权，也可以用来引导宾语从句，如：
- I don't know whose car is parked in front of my house.
- Can you tell me whose idea it was to cancel the project?
which
which通常用来询问事物的种类或者特征，也可以用来引导宾语从句，如：
- I don't know which book you are referring to.
- Please tell me which restaurant you want to go to.
when
when通常用来询问时间，也可以用来引导宾语从句，如：
- I don't know when he will come back.
- Can you tell me when the next train will arrive?
where
where通常用来询问地点，也可以用来引导宾语从句，如：
- I don't know where he lives.
- Can you tell me where the nearest post office is?
why
why通常用来询问原因，也可以用来引导宾语从句，如：
- I don't know why he is so angry.
- Please tell me why you didn't come to the party.
how
how通常用来询问方式或者方法，也可以用来引导宾语从句，如：
- I don't know how to solve this problem.
- Can you tell me how you learned to speak Chinese?
总之，疑问词在宾语从句中的使用非常灵活，掌握了它们的用法，可以使我们的表达更加恰当、准确。希望本文能够对你有所帮助。
