Ответ:

1. He would not make so many mistakes.

2. If we went to England.

3. If we had been more adventurous.

4. You would have acted differently.

5. They would have gone to the beach.

6. Perhaps he would have a different view.

7. If the film had not been so boring we would have not left, but the film was terrible.

8. If the house was equipped with a solar panel.

9. If the band gave a concert here, all my friends would go.

10. If he was in your shoes.

11. If I were you I would not smoke so much.

12. If I had known you were in hospital I would have visited you.