1) You must take three pills every day.
Three pills must be taken every day.2) The doctor gave you a prescription for a cough mixture. A prescription for a cough mixture was given to me by the doctor / I was given a prescription for a cough mixture by the doctor
3) The nurse has given me an injection. An injection has been given to me by the nurse / I have been given an injection by the nurse.
4) The surgeon put my leg in a plaster. My leg was put in a plaster by the surgeon.
5) I have to rub ointment on my shin. Ointment has to be rubbed on my shin by me.
6) The assistant is making an appointment. An appointment is being made by the assistant.
7) Nobody can heal these wounds. These wounds cannot be healed by anybody.
8) The nurse asks for a urine sample. A urine sample is asked for by the nurse.