They play football at weekends* (Nie ma słowa "are", więc jest to Present Simple, czyli They play.)
Are they playing football at weekends?
They aren't playing football at weekends.
Odpowiedź:
They play football at the weekends.
Do they play football at the weekends?
They don't play football at the weekends.
Wyjaśnienie:
Trzeba tu użyć czasu Present Simple, dlatego że jest "at the weekends".
