19 if she had been able to answer the question she wouldn't have failed the exam

20 if peter hadn't been very nervous he wouldn't have failed the driving test

21 if he got a job he could pay his bills

22 if she didn't sit around too much she wouldn't be fit

23 if the fire brigade hadn't come immediately the house would have burnt down

24 if sue hadn't walked to work in the rain she wouldn't have caught a cold

25 if the water weren't too dirty we could bathe in this part of river 

26 if we didn't have four air conditioners in our house we wouldn't spend too much money on electricty

27 if I had Linh's address I could write to her

28 if dick didn't drive carelessly he wouldn't cause accidents

29  if we didn't waste a lot of money on unnecessary things we could give much help to the poor

30 if I had a watch I could tell you what time it is

31  if she had learnt mathematics she wouldn't have cheated by that salesman

32 if the clock had been right we wouldn't have missed the train

33 if the dress weren't very expensive she could buy it

34 if peter didn't eat so many chips he wouldn't be fat

35 if I hadn't studied  hard I wouldn't have passed the final examination

18 if she hadn't gone in the rain last night she wouldn't have had a cold now

19 if the hadn't left the door open the thief wouldn't have broken into their house 

20 if he didn't work twelve hours a day he wouldn't be tired

21 if he had studied his lessons carefully he wouldn't have got bad marks now

22 if I had had enough money I would have bought that shirt

23 if minh were here now he could tell you that story

24 if carol hadn't been studying she would have answered the phone

25 if we had known you were in the hospital we would have visited you

26 if you don't do your exercises you will fail the exam

27 if you save your money you will be able to buy the house

28 unless you behave yourself your parents will be very unhappy

29 if you don't do it carefully you will feel sorry afterwards

30 if you don't ask him first he won't offer to help

31 unless you be calm you will make a wrong decision

32 if you don't be careful you will cut yourslfe with that knife

33 if my brother had enough money he would have buy that car

34 if it weren't rain we would go out

35 if I knew his address I could contact him