1) Our school day is over at 3 o'clock.
а) Is our school day over at 3 o'clock?
б) When is our school day over?
в) Our school day is over at 3 o'clock, isn't it?
2) Mike plays with his friends after the lessons.
а) Does Mike play with his friends after the lessons?
б) Who plays with friends after the lessons?
в) Mike plays with his friends after the lessons, doesn't he?