Fill  in "must" or " have to" then say who decides. 1. I... brush my teeth. 2. I... brush my teeth. 3. I... tidy my room.  4.I... tidy my room. 5. I... take the medicine.  6. I... take the medicine.   

1. I must brush my teeth. - anyone, most likely some disobedient child. 2. I have to brush my teeth. - a patient of dentist's, a human with diseased tooth. 3. I must tidy my room. - anyone, most likely some disobedient child. 4.I have to tidy my room. - anyone, probably a child. 5. I must take the medicine. - someone with easy form of illness. 6. I have to take the medicine. - most likely, a regular patient