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Past Simple gt; глагол + 2 форма глагола/ed
Past Perfect gt; had + 3 форма глагола/ed

1. The teacher understood that Lily hadn't done her homework.
2. The children had put away all their toys before mother arrived.
3. The rain had already ended before we set off for the journey.
4. The whole family was sitting in the room. (?)
5. Grandmother was telling that my aunt had finally finished decorating the house by June.
6. She had eaten all the chocolates before they had dinner.
7. Melisa told that she had found a good recipe for the dinner.
8. By the time i woke up my sister had already come back from her morning training.