1：will/shall 不定式
will/shall 本身是情态助动词，它们表示的情态意义多半带有“将来”的含义。will 不定式，可用于一切人称的主语表示未来的时态，用shall 不定式 表示纯粹的将来。
eg:
The next train to Benjing will leave at 8 a.m.
If the crops fail,There will be a famine.
You will feel better after taking this medicine.
We shall know the result next week.
Do you think it will rain tomorrow?
有时即表示将来，也含有意愿或意图
I will do it ,if you like .
As the railway is not yet open to traffic,we shall go by boat.
I promise to pay him back in time ,but he won't lend it to me .
在疑问句中will/shall 还可用来征询听话人的意图
Will you be at home at seven this evening ?
What shall i do with with your mail ?
2:be going to 不定式
这一结构的主要意义，一是表示意图，及打算在将来做某事。
eg:
Are you going to post that letter by air mail?
How long is he going to stay here ?
We're going to call a meeting to discuss it .
be going to 不定式的另一意义是表示“预见”，即现在已有迹象表明将要发生或即将发生某种情况。
eg:
I feel dizzy.i think i'm going to faint.
Good heavens !I must hurry.i'm going to be late
上述be going to 不定式表示意图的用法有时可与will 不定式互换使用。
eg:
I won't tell him about it .
=I am not going to tell him about it .
3:be -ing
这一机构的意义是表示按计划、安排即将发生的动作，常用于表示为主转移的动词，如go,come,leave,start,arrive等，也可用于其他动态动词。
eg:
We're leaving on Friday.
The President is coming to the UN this week.
We're moving to a different hotel the day after tomorrow.
有很多动态动词都可用现在体表示将来。
eg:
Dinner is ready.We're having fish for dinner .
He is writing to you tomorrow .
Today i'm showing the Hunts round Shanghai.
The new piano is being delivered this afternoon.
4:be to 不定式
这一结构的主要用法，一是表示按计划、安排即将发生的动作。
I am to have tea with Betty this afternoon.
There's to be an investigation.
常见于报纸和广播，用以宣布官方的计划或决定。
eg:
The Queen is to visit Japan next year.
The Prime Minister is to speak on television tonight .
5:一般现在时
用一般现在时表示将来时间，常见于条件状语和时间状语分句。
eg:
If she comes ,i'll tell her all about it.
I'll give it to you after i return.
It won't be long before the rain stops.
在主句中用一般现在时表示将来时间通常指按照时间表或既定日程一定会发生的将来时态。
eg:
He's in all day Sunday.
She retires next month .
Tomorrow is Saturday.
