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一、一般现在时
1. 在表示时间、条件的状语从句中,用一般现在时表示将来的概念。如:
As soon as he comes back, I’ll tell him when you will come and see him.
If they are kept for too long, some medicines will lose their effectiveness.
2. 一些转移动词come, go, arrive, leave, start, begin, return等的一般现在时表将来,用来表示在时间上已确定或安排好的事情。如:
The yearly meeting starts 10 o’clock next Friday.
My plane leaves at 8:30 tomorrow morning.
二、现在进行时
1. come, go, start, arrive, leave, stay, die, stop, start, finish, approach等非延续性动词的现在进行时表示近期按计划或安排将要发生的动作。如:
The time is approaching when we must think about buying a new house.
Are you staying here till next week？
2. 现在进行时与always, constantly, forever等连用,表示意想不到或使人烦恼的事情。如:
She is always borrowing money and forgetting to pay back.
3. 在表示时间、条件的状语从句中,用现在进行时表示将来进行时。如:
Be careful when you are crossing the street.
If Tom is doing his homework when you come back, don’t disturb him.
三、现在完成时
在时间和条件状语从句中,用现在完成时代替将来完成时。如:
I’ll phone you after I have talked about this matter with my parents.
We’ll go to the cinema if we have finished our essay by that time.
现在完成时经常与for ...,since ...,till(until), now, up to the present (now),so far, in the past (last) ...,already, yet, recently, lately, ever, never这些状语连用。
四、一般将来时
1."will / shall +动词原形"与"be going to +动词原形"的区别:
"will / shall +动词原形"表示单纯的将来或在说话时临时决定要去做某事。如:
There will be a lecture at the Children’s Palace at seven this evening.
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