8) The kids __________ (to play) football on the football pitch now.

8) The kids aren't playing football on the football pitch now.

Для образования отрицательной формы Present Continuous (am/is/are + not + V-ing) после вспомогательного глагола (am, is, are) добавляется отрицательная частица not.

Ответ: aren't playing