Answer:
1. If I had gone there yesterday, I would have talked to her.
2. If we have enough money, I will go to Paris.
3. If he works harder in future, he will get much money.
4. If he is honest, nobody will hurt him.
5. You will fail the exams next month unless you study hard.
6. If yesterday had been the holiday, I would have gone to London.
7. If I had known your number, I would have phoned you.
8. I would go to Bangkok if today had been the holiday.
9. If I were a millionaire, I would travel around the world.
10. If it rains, she will not go with me tomorrow.