Tell me the reason why he was fired.

It is a mystery why he quit his job.

It is a mystery why he did not finish the poem.

Why do cats' eyes shine in the dark?

Why didn't you call me up?

Why don't you apply for the job of interpreter?

Why don't you ask for a pay raise?

Why don't you consult an attorney in person?

Why don't we have lunch together?

Why don't you try a different tack?