某些表示位移的动词或短语如:come, go, leave, start, take off, set off等,常用一般现在时或现在进行时分别表示按时间表和计划、安排将要发生的事。如:
The next train leaves at 10 o’clock in the morning. There is half an hour to go.
Ladies and gentlemen, the flight is taking off. Please turn off your computers and mobile phones.