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Ответ:

2 If we'd known what was happening, we would have called the police.

3 If you had listened to the instructions, you'd have known what to do.

4 If the children had eaten more breakfast, they wouldn't have been hungry.

5 You would have seen me if you'd waited a bit longer.

6 We'd have gone swimming if it had been sunny.

7 If we had lost the match, I would have been so upset.

8 I would have gone to the party if I hadn't been ill.

Объяснение:

Условные III типа означают нереальное условие / предположение, что могло бы случится в прошлом, и строятся по схеме:

If + Past Perfect, would have+infinitive.