Помогите, пожалуйста англ. сделать, просто с временами не дружу

Нужно раскрыть скобки в правильном времени: Indefinite Infinitive,Continuous Infinitive или Perfect Infinitive.
1. Now she acted as if she (not to care).2. Even if I (to see) her at the party I (can, do) nothing for you.3. Mary is staying with me. I think it (to be) a good thing if you come and see her.4. In the old days it (not to be) so simple to travel so far.5. I wish you (to turn) the radio down.6. It (to make) small difference to the universe if I never (to exist).7. If Ed ( to learn) about it he will probably never speak to me again.8. I wish (to inform ) him about everything beforehand.9. If you (to be) here now you (to help) your brother.10. He sat at the desk as though he (to write) something.