10) They_________ handball since they were 10. (NOT PLAY)

10) В задании необходимо образовать Present Perfect tense глагола to play.

Общая формула Present Perfect: have/has + not + V3

Вспомогательный глагол have используется с местоимениями I, you, we, they.

Вспомогательный глагол has используется с местоимениями he, she, it.

Третья форма глагола to play - played.

Получаем: They have not played handball since they were 10.

Ответ: They have not played handball since they were 10.