The key to exercise solutions in chapter Unit 114 - in case for the textbook English Grammar in Use with authors Raymond Murphy from Cambridge University Press
Question
What do you say in these situations? Use in case.
Answer
I’ll give you my phone number in case you need to contact me.
I’ll say goodbye now in case I don’t see you again (before you go).
Can you check the list in case we’ve forgotten something? / Can you check the list in case we forgot something?
Keep the receipt in case they don’t fit you (and you have to take them back to the shop).