The most common questions in English are often referred to as ‘wh’ questions. ‘Wh’ questions begin with ‘wh’ and include:
How is often included with these why questions, even though it does not begin with ‘wh’. ‘Wh’ questions ask for specific responses as to the time, place, reason, thing or person.
Where – asks a question about place
When – asks questions about time
Why – asks questions about reasons
What – asks questions about things or objects