19.If he took some exersises, he wouldn't be so unhealthy.
20.If I had the right change,we could get the ticket.
21.If you study hard,you will pass the exam.
22.If you aren't impatient,you will make mistakes.
23.If I had eaten lunch,I wouldn't be hungry now.
24.Unless they invite me,I won't come.
25.If he had revised all his lessons,he wouldn't have failed the exam.
26.If you walk to the park,it will take 5 minutes.
27.Unless you leave me alone,I will call the police.
28.If it wasn't snowy,the children could go to school.
29.Unless you tell me the whole truth,I won't help you.
30.If he weren't very bad-tempered, his wife wouldn't have left him soon after marriage.
31.If you tell lies to your boss,you will be fired at once.
32.If you don't keep silent,you will wake the baby up.
33.If you don't stop talking,you won't understand the lesson.
34. If I knew her number,I would ring her up.
