一般现在时代替一般将来时常见如下：
1、谓语动词是：come，go，arrive，leave，start，begin，return，live，fly 等，可以表示将来发生的动作。
The train leaves at six tomorrow morning.
When does the bus start?
It starts in ten minutes.

2、在时间或条件从句中，一般要用一般现在时表示将来，而不用一般将来时。
When Bill comes, ask him to wait for me.
I'll write to you as soon as I arrive there.

3、谓语动词是 hope，take care that，make sure that 等后的宾语从句中，用一般现在时表示将来。
I hope they have a nice time next week.
Make sure that the windows are closed before you leave the room.

4、这种时态可以和一个时间短语连用以表示已确定的、对将来的安排：
如：The boys start school on Monday. 男孩们星期一开学。
I leave tonight. 我今天晚上动身。