Question Word what
Function asking for information about something asking for repetition or confirmation
Example What is your name? What? I can't hear you. You did what? What did you do that for? When did he leave? Where do they live? Which colour do you want? Who opened the door?
what...for when where which who
asking for a reason, asking why asking about time asking in or at what place or position asking about choice asking what or which person or people (subject) asking what or which person or people (object) asking about ownership
whom
Whom did you see?
whose
Whose are these keys? Whose turn is it? Why do you say that? Why don't I help you? How does this work? How was your exam? see examples below How far is Pattaya from Bangkok? How long will it take? How many cars are there? How much money do you have? How old are you? How come I can't see her?
why why don't how
asking for reason, asking what...for making a suggestion asking about manner asking about condition or quality
how + adj/adv how far
asking about extent or degree distance
how long how many how much
length (time or space) quantity (countable) quantity (uncountable)
how old how come (informal)
age asking for reason, asking why