Question words

Why …?
To ask about reason.
Why are you sad?.

To ask about time.
When is your birthday?
When…?

To ask about choice.
Which is your favourite colour, black or white?
Which…?

To ask about place or position.
Where is your house?
Where…?

To ask about age.
How old are you?
How old…?

To ask for information.
What is your name?
What…?

To ask about people.
Who is that girl ?
Who…?