8. I (make) a snowman while they (skate).
Для решения данного задания необходимо знать формы глаголов в Past Simple и Past Continuous.
Я делал снеговика, пока они катались на коньках.
Правильные формы глаголов:
Получаем предложение:
I was making a snowman while they were skating.
Ответ: I was making a snowman while they were skating.