用于构成特殊疑问句，其中what, which, whose兼有形容词特征，可以和名词连用。
What job do you want to find? /Whose girl is she?
Which subject is your best one?
所有疑问代词都可以起名词作用，在句子中担任成分。
Who told you?
/Whom are you waiting for?
Whose are those books?
在学习疑问代词时，对以下几组词注意区别：
1） which和what
两者均可与名词连用，就人或物提问。但是which一般用于有一定选择范围的情况，what用于无选择范围或究竟是什么还不清楚的情况。
Which colour do you like-green, red, yellow or brown?
What colour is her dress?
What writers do you like best?
2）which和who 两者都可作代词，它们的区别是不管选择的范围是大还是小，which一般用作指物。
Which would you like to eat -steak or fish?
Who won the game -Smith or Johnson ?
当有一定选择范围时，which one代替who作宾语.
Which one do you like better, your mother or your father?
Which of可和人称代词或指人的名词连用,如：
Which of you has taken away my English book?
3)连接代词who, whom, whose, which, what, whatever, whoever等，除起连接作用外，还可以在从句中担当主语，宾语，定语，表语等成分。如：
The question is who can operate the new machine.（引导表语从句--作主语）
They asked whose idea this was.（引导宾语从句--作定语）
When you are older, you can watch whatever programme you like.
（引导宾语从句--作定语）
I'll give my ticket to whoever wants it.
（这里whoever可看成'anyone who'，or'the person who'）.
