1) Nick learns poems on Sunday.
Does Nick or Oleg learn poems on Sunday?
Nick doesn't learn poems on Sunday.
2) I do the sums at Maths.
Do I do the sums at Maths?
I don't do the sums at Maths.
3) My friend speaks English at the lessons.
My friend speaks English at the lessons, doesn't he?
My friend doesn't speak English at the lessons.