Как составить предложение? he/is/riding/a/bike?

Как составить предложение?

he/is/riding/a/bike? — Is he riding a bike? — Он едет на велосипеде?

Who is riding a bike?

What is he riding?

Is he or is she riding a bike?

Is he riding or washing a bike?

Is he riding a bike or a horse?

He is riding a bike, is not he?