Who

Q : Who broke the windows?

A : John did.

What

Q : What did he use to break the windows?

A : He used a stone to break the windows.

Where

Q : Where is the broken window?

A : The broken window is on the second floor.

When

Q : When was the window broken?

A : It was broken yesterday.

Why

Q : Why did he break the windows?

A : He was too playful.

How

Q : How did he break the window?

A : He threw a stone at the windows.