Why don't you give me a ride?

Why don't you admit your mistake?

Why have you delayed seeing the dentist?

I don't know why he was late.

Why don't you join our party?

Why don't you go to school with us?

There is no reason why I should help him.

There are several reasons why I have a fever.

Why don't you sit down and relax?

Why don't we eat at a restaurant tonight?