Unit 305 What happened to the elevator?電梯怎么了?

Unit 305 What happened to the elevator?電梯怎么了?
    I think we have to take the stairs.
    What happen to the elevator.
    It is out of order.
    What happen to the lift.
    What happen to John.
    What happen to your plan.
    broken
    My watch is broken.
    The air-conditioner is out of order.
    lavatory, water fountain,
    My car is broken down.
    My TV is broken.