Краткий ответ

1. were you doing … came
2. Did you have
3. didn't go
4. didn't watch
5. wasn't sleeping … broke
6. were playing … started
7. saw … was crossing
8. began
9. was repairing

Логика: длительное действие — Past Continuous, короткое/завершённое — Past Simple.

Вот слова, которые нужно нажать (выделить как ошибки) в каждом предложении:

1. was swimming (нужно were swimming, т.к. My parents and I — множественное число)
2. — (ошибок нет)
3. — (ошибок нет)
4. was planted (нужно просто planted — Past Simple)
5. was watering (нужно were watering, т.к. My friends — множественное число)
6. repaired (нужно was repairing, т.к. действие длительное: while)
7. saw (нужно we saw, пропущено подлежащее we)
8. — (ошибок нет)