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Ответ:

1. I would have given you a lift.

2. You should have revised more for your exam.

3. Everybody must have gone.

4. She can't have failed the exam.

5. You shouldn't have been  so rude to the teacher.

6. I might have seen you before.

7. You needn't have bought so much food.

8. I could have made one mistake in the test.