6. My friends (not to do) their home work at seven o'clock yesterday. They (to play) volley-ball.

Ответ (EN)

My friends were not doing their homework at seven o'clock yesterday. They were playing volley-ball.

Перевод (RU)

Мои друзья вчера в семь часов не делали домашнюю работу. Они играли в волейбол.

Ответ: were not doing, were playing

Отлично! Ты правильно определил нужное время и построил предложения. Продолжай тренироваться!