Question

In which sentence is the subject an understood you?

a. Mom told us to clean up our rooms.
b. Billy shoved his toys under the bed.
c. Hang up your clothes when you get home.
d. My little brother doesn't want to clean his room

Answer 1

C is the correct answer.  In A, mom is the the subject.  In B, Billy is the subject.  In D, brother is the subject.  In C, the sentence is imperative, meaning that it is demanding YOU to hang up your clothes.