You shouldn't use your roommate's things without their permission.
When Jenna got out of the shower, she realized she couldn't find her hairbrush.
Jenna wants to brush her hair before it dries.
Jenna uses an old comb to brush her hair instead and orders a new brush from Amazon.
Jenna goes into her roommate's room and borrows her hairbrush without asking.
It takes longer for Jenna to brush her hair, but she avoids conflict with her roommate.
Jenna's roommate sees Jenna's hair in her brush and installs a lock on her door.