Don't somke until the plane takes off 这句主语是什么?

Don't somke until the plane takes off 这句主语是什么? Don't you smoke until the plane __ off.A takes b has taken 为 Don't you smoke until the plane __ off. The plane takes off at 9.15 in the morning 同义句 The plane （）t when the plane takes off这句话是什么意思 the plane takes off at xx time. Plese what time the plane takes off. You should () when the plane takes off Don't get off the bus until it ____ Don't get off the bus until it ___. Don`t get off the bus until it ___(stop) don't smoke until the piane ____ off.