It's possible that you'll stay at home for the summer but I don't know what you will do....

Question

It's possible that you'll stay at home for the summer but I don't know what you will do. what........(you\do) if you stay at home for the summer

Answer 1

......Will you do....

Answer 2

It's possible that you'll stay at home for the summer but I don't know what you will do. what will you do if you stay at home for the summer