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) my advice. 5. I wouldn’t phone you here unless it (be) urgent. 6. She’ll catch cold, if her feet (get) wet in this weather. 7. Unless you apologize at once, I never (speak) to you again. 8. If we (have) nothing to do, life would be boring.

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.