2. Dan had finished the essay by the time it got dark.
3. Mike and Helen had planted a tree in the garden by the time it got dark.
4. Mum had left the office by the time it got dark.
5. The children had returned home by the time it got dark.
6. Molly had washed the dishes by the time it got dark.
Объяснение:
2. Dan had finished the essay by the time it got dark.
3. Mike and Helen had planted a tree in the garden by the time it got dark.
4. Mum had left the office by the time it got dark.
5. The children had returned home by the time it got dark.
6. Molly had washed the dishes by the time it got dark.
Объяснение: