Who: Who is used to ask questions that are referring to people.
Who is your father?
Who hors there ?
Who has not come?
What : This is used to ask question when we want to know the details about the subject matter that we have been given. Examples are
What is your name ?
What is going on there ?
What is a noun ?
Where : Where is used to ask question that pertain to location or has to do with whereabout.
Where are you going ?
Where is the love ? Where have you been ?
Why : it is used to ask questions about the purpose of an action that is done
Why have you done that ?
Why do you behave the way you do ?
Why ask why ?
Sent from my Blog www.naijagoogleblogger.blogspot.com