Here are wishes for the sentences:
- You want to buy a new car, but you haven’t got any money.
- I wish I had enough money (to buy a new car).
- You didn’t follow your friend’s sensible advice.
- I wish I’d followed my friend’s advice.
- You lost your lecture notes.
- I wish I hadn’t lost my lecture notes.
- You want to ask a friend to help you, but he’s out of the country.
- I wish my friend wasn’t out of the country.