when the plane takes off这句话是什么意思

when the plane takes off这句话是什么意思 You should () when the plane takes off Have you_____(查明)when the next plane takes off? Do you know when the plane takes off?为什么不用将来时when the plane the plane takes off at xx time. Plese what time the plane takes off. 这句话有什么错误?The plane has already taken off when we got to the 英语句子时态问题.the plane will take off at 9:00the plane takes off The plane takes off at 8 o'clock The plane will take off at Don't somke until the plane takes off 这句主语是什么? Do you know _______ the plane takes off? The plane takes off at 7:00,____ it?