Here are the completed sentences:

26. If her condition should improve, we’ll inform you immediately. **Should** her condition improve, we’ll inform you immediately.

27. If you were able to go abroad for the summer, where would you go? **Were** you able to go abroad for the summer, where would you go?

28. If the hole in the ozone layer had been discovered sooner, fewer people would have got skin cancer. **Had** the hole in the ozone layer been discovered sooner, fewer people would have got skin cancer.

29. I don’t like your criticizing me all the time. **I wish** you wouldn’t criticize me all the time.

30. It’s awful - Sam doesn’t know how I feel about him! **If only** Sam knew how I feel about him!

31. I’d love to be with you in Switzerland right now. **I wish** I were with you in Switzerland right now.

32. Frank regrets not taking the job when he had the chance. **Frank wishes** he had taken the job when he had the chance.