Question

what,where ,who,which,who,whom,how都是什么词性

Answer 1

what who which who whom 是代词，在句中可做主语，宾语和表语，但whom中做宾语。
如 What is happening in the classroom?
I believe what you said.
Could you tell me which is the nearest way to the post office?
Give the book to any who likes it .
You can invite anyone whom you like to your party.
wher how是副词在句中做状语。where在引导名词性从句时还可做表语，如
I don't know where it is.
My problem is how we can finish the work in such a short time.
Where can we buy such beautiful clothes?

追问

那么why与whether什么词性

追答

why是副词，在句中做状语。whether无词性，只有词义引导名词性从句，不做从句成分。如
I don't know whether he likes the gift that I gave him.
The reason why he didn't go to school is that he was will.

Answer 2

where。how。关系副词，引导从句时做状语
what
who which whom。what。是关系代词引导从句时做主、宾、表、定（名词性从句）

Answer 3

疑问副词