疑問代詞有who（主格）,whom（賓格）,whose（所有格）,what 和 which 等.
疑問代詞用于特殊疑問句中,一般都放在句首,并在句中作為某一句子成分.如：
Who is going to speak to us tomorrow?明天誰來跟我們講話?（who作主語）
Who told you so?是誰告訴你的?（who作主語）
Whom are you talking about?你們在說誰?（whom 作賓語,但在句首時口語中常用who代替whom）
Whose umbrella is this?這是誰的傘?（whose作定語）
What is that?那是什么?（what 作表語）
What did he say?他說什么?（what 作賓語）
Which is yours,the blue pen or the red one?藍筆和紅筆哪一支是你的?（which 作主語）
注1：疑問代詞who,what,which等后面加單詞ever,可用來強調(diào)語氣,表達說話人的各種感情.如：
What ever do you want?你到底想要什么?
Who ever is she looking for?她究竟是在找誰?
注2：which表示在一定數(shù)目（或范圍）之內(nèi)的選擇,what則沒有這種限制,如：
What do you usually have for lunch?你們午飯通常吃些什么?
Which do you prefer,rice or buns?米飯和饅頭你愛吃哪個?
Which of you comrades come from the Northeast?你們同志們中間誰是東北人?
(希望有所幫助,