21. If you don't keep quiet, you'll wake the baby up.

22. If you don't leave immediately, I will call a guard.

23. If I knew her number, I would ring her up.

24. Unless you go right now, you'll be late for the train.

25. If you aren't careful, you will cut yourself with that knife.

26. If she wasn't often absent from class, she could keep pace with her classmate.

27. If I had known Alice's address, I could have written to her.

28. If it was not cold, we could go swimming.

29. If we had had a mapm we wouldn't have got lost.

30. If you didn't drink too much coffee, you could sleep.

31. If the farmer had had enough rain, they could have grown rice.

If his friends had not been late, they would not have missed the train.

32. If today was Sunday, the pupils could go swimming.

33. If we had a big house, we could invite friends to stay.

34. If he doesn't phone immediately, he won't get any information.

hello