Alguien puede explicarme por favor como se hace el condicional tipo 3 por favor?

. If she had been there, I would have seen her.

2. If we had had more time, we would have visited Pompeii.

3. If I had studied more, I would have passed the exam.

4. If I had been able to afford it, I would have bought the Porsche.

5. If Bill had arrived earlier, we wouldn’t have missed the train.

6. If I hadn’t lost my keys, we would have been able to get in the house.

7. If they hadn’t told me about the exhibition, I never would have known.

8. If I hadn’t gone to the concert, I would never have met Sylvia.

9. If you had answered the phone, I would have told you the news.

10. If she had been friendlier, she wouldn’t have offended anyone.