1. If it (rain), I won’t go out. 2. You would learn more if you (study) sometimes. 3. If he (ask) me, I would have told him the answer. 4. You would have done well if you (take)…

Here are the correct verb forms for the sentences you've provided:

1. If it rains, I won’t go out.
2. You would learn more if you studied sometimes.
3. If he had asked me, I would have told him the answer.
4. You would have done well if you had taken my advice.
5. I wouldn’t phone you here unless it were urgent.
6. She’ll catch cold if her feet get wet in this weather.
7. Unless you apologize at once, I never will speak to you again.
8. If we had nothing to do, life would be boring.

These sentences illustrate different conditional forms: zero, first, second, and third conditionals.