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?