The key to exercise solutions in chapter Unit 39 - if I knew ... I wish I knew ... for the textbook English Grammar in Use with authors Raymond Murphy from Cambridge University Press
Question
Write a sentence with if ... for each situation.
Answer
If you didn't live so far away, we'd see you more often.
I would buy them if they weren't so expensive.
We would go on holiday if we could afford it.
We could have lunch outside if it weren't / wasn't raining.