1）下列动词：come、go、arrive、leave、start、begin、return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。

例句：

The train leaves at six tomorrow morning.

When does the bus star? It stars in ten minutes.

2）倒装句，表示动作正在进行。

例句：

Here comes the bus. = The bus is coming.

There goes the bell. = The bell is ringing.

3）在时间或条件句中。

例句：

When Bill comes （不是will come）, ask him to wait for me.

I'll write to you as soon as I arrive there.

4）在动词hope, take care that, make sure that等后。

例句：

I hope they have a nice time next week.

Make sure that the windows are closed before you leave the room.