После you вставить must/mustnt/ need/neednt и тд
7) You
leave the camp without permission.
8) You
eat in your bedrooms.
9) You
water the flower. I have already done it.
10) You
bring mobile phones to school, but you are allowed to use them only during the breaks.
11) You
do all the activities, it's not necessary.
12) You
open the window, but you can do it if you want.