Wh-Questions
Who?
Asks about a person
Example:
Who works at a school?
A teacher
What?
Asks about a thing or action
Example:
What do you use to unlock a door?
A key
Where?
Asks about a place
Example:
Where do you live?
In a house
When?
Asks about a time
Example:
When do you eat breakfast?
In the morning
Why?
Asks about a reason
Example:
Why do you go to sleep?
Because you are tired