1.疑问代词是问何人、何物、何者的代词,如:who( 谁,问人）whose（谁的,问所有者）,whom（谁,问人,是who的宾格）,which（哪一个）,what(什么,问东西）等.
2.疑问代词后不可接名词,如接名词,即为疑问形容词.
Whose is this pen?这笔是谁的?
Whose是疑问代词.
Whose pen is this?这是谁的钢笔?
Whose是疑问形容词.
3.疑问代词没有数的区分,作主语时,除非在疑问句本身中已清楚表明疑问词所代表的人或物是复数,其后的谓语动词一律用单数形式.
Who lives in this room?谁住在这房间?
What has happened?出了什么事?
Who are these people?这些人是谁?
4.who和what在指人时意义不同.who问姓名、亲属关系,what问身分、职业.
Who is he?他是谁?
What is he?他是做什么的?
5.疑问代词用来构成特殊疑问句,一般放在句首,并充当某一句子成分,如主语、主语补语、宾语.
Who will join us?谁愿意加入我们?
who作主语.
Who is the man carrying a brown suitcase?那个提着棕色手提箱的人是谁?
who作主语补语.
Whom did she marry?她嫁给了谁?
whom作宾语.
With whom did she dance the Waltz?她跟谁跳的华尔滋舞?
whom作介词with的宾语.
Which do you prefer,beer or whiskey?你喜欢啤酒还是威士忌?
which作宾语.
6.可以引导名词从句,将两个从句连接起来,并在从句中担任成分.
Do you know what her name is?你知道她叫什么名字吗?
what在从句中作主语补语.
Tell me which is better.告诉我哪个好一些.
which在从句中作主语.
