Help 1-8 với mọi người

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1. Unless he had been too lazy, he wouldn't have failed the exam.

2. If yesterday had not been a nice day, we wouldn't have gone camping.

3. Unless you had driven carefully, you would have had a serious accident.

4. Unless the bus had been crowded, he wouldn't have walked to the office.

5. If you had not studied hard, you wouldn't have passed the test.

6. If you had not helped me, I wouldn't have finished our homework.

7. If the meeting had not been so long, they wouldn't have felt tired.

8. Unless he had been too lazy, he would have passed the exam.