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

6. My number isn’t in the directory so people don’t ring me up.

=>If my number were in the directory people would ring me up

7. He is very thin perhaps that’s why he feels very cold.

=>If he weren't very thin, he wouldn't feel the cold so much

8. I’m fat; that’s why I can’t get through the bathroom’s window.

=>If I weren't fat, I could get through the bathroom window

9. He doesn’t help me, possible because I never ask him for help.

=>If I asked him for help, he wouldn't help me

10. I can’t drive so we can’t take the car.

=> If I could drive, we could take the car