1、在主从复合句中,当主句为一边将来时,时间状语从句和条件状语从句中用一般现在时代替将来时,
When he comes (不是will come),ask him to wait for me here.
I'll write to you as soon as I arrive there.
2、表示按规定、计划或时间表将要发生的事.
He starts next week.他下个星期出发.
We leave very soon.我们很快就离开.
The train starts at 10 o'clock in the morning.
火车将在早上10点开出.
这类用法限于表示“移动”的动词：go去,come来,leave离开,start出发,begin开始,
下列动词：come,go,arrive,leave,start,begin,return,live,fly的一般现在时表将来.这主要用来表示在时间上已确定或安排好的事情.
The train leaves at six tomorrow morning.
When does the bus start?It starts in ten minutes.
在动词hope,take care that,make sure that等后.
I hope they have a nice time next week.
Make sure that the windows are closed before you leave the room.
