Here are the correct forms of the verbs using the conditional TYPE 3:

1. If the weather **had been** nice yesterday, they **would have played** football.
2. It was an awful meal. If we **had gone** to a good restaurant, we **would have had** a better dinner.
3. If he **had listened** to me, he **would not have failed** in the exam.
4. But for the storm, we **would not have been** late for the appointment.
5. If the ambulance **had come** earlier, the victim **would not have died**.
6. If it **had been** for your absence yesterday, you **would have understood** the lesson today.
7. If the police **had come** earlier, the burglar **would have been arrested**.
8. Without his parents’ money, he **would not have succeeded**.
9. If you **had remembered** to fill up before the journey, we wouldn’t have lost half an hour looking for a petrol station in an unknown city.
10. If I **had accepted** the offer, I **would not regret** now.
11. If I **had been** younger, he **would have taken** part in the last contest.
12. The accidents **would not have happened** if the car in the front **had not stopped** so suddenly.
13. I would have visited you before if there **had not been** quite a lot of people in your house.
14. If I (had known) that you were ill, I **would have gone** to see you.
15. Thank God Sue came on time! You **would not have found** the keys without her.