Помогите пожалуйста с 16 заданием, прошу вас не разумею

1. If I had chosen another faculty, I would have studied better

2. If we had bought tickets online, it would have been cheaper

3. If you had seen him yesterday, you would have laughed.

4. If you had talked to her yesterday, she would have understood

5. If you had asked me yesterday, I would have changed my plans.

6. If I had had more free time, I would have learnt Chinese

7. If you had not helped me yesterday, I would not have done it

8. If it had not been so windy, we would have had breakfast in the yard yesterday

9. If we had had more free time, we would have spent one more day at Hastings