1. He smokes so much, perhaps that’s why he can’t get rid of his cough.
=> If he didn't smoke too much, he could get rid of his cough
2. She is very shy, that’s why she doesn’t enjoy parties.
=> If she weren't shy, she would enjoy the party
3. I haven’t the right change so we can’t get tickets from the machine.
=> If I had the right change, we could get tickets from the machine
4. They speak French to her, not English, so her English doesn’t improve.
=> If they spoke English to her intead of English, her English would improve
5. He doesn’t work overtime, so he doesn’t earn as much as I do.
=> If he worked overtime, he would earn as much as I do