1. If it costs too much, I will buy a small one. 2. If you drove more carefully, you wouldn't have so many accidents. 3. What would happen if there were no gravity? 4. If I make that mistake again, my teacher will get angry with me. 5. If I spoke English, my job would be a lot easier. 6. If he had gone to London yesterday, he would have met his old friend. 7. Would you mind if you suddenly won half a million pounds? 8. I will lend them some money if they ask me. 9. If we knew who he was, we would invite him to speak at our meeting. 10. If they had invited us, naturally we would have gone to the party. 11. If Don and I had enough money, we would buy a house. 12. Ice turns to water if you heat it. 13. I would have spoken to France if I had seen him yesterday. 14. If I had realized that the traffic lights were red, I would have stopped. 15. They won't let you in if you come late. 16. If you don't go away, I'll send for a policeman. 17. If I were in your place, I would accept Mr Long's offer. 18. If I won a big prize in a lottery, I would give up my job. 19. If Tom had been here yesterday, he would have been able to advise us.