表达将来时的几种结构:
01. be going to do
表示最近打算进行的事,具有一定的目的性和计划性.(这种安排既有可能是主语做出的,也有可能是别人安排的)
We are going to have a meeting tomorrow.
表示即将要发生的事情，不可避免要发生的事情.(多用于表天气)
It's getting cloudy. It is going to rain.
02. be to do
表示按计划要发生的事,一般认为,这种计划是双方约定的,而be going to do 所指的安排不一定是双方约定的.
We are going to meet them at the north of the bridge, because it is the only road they can follow.
我们打算去桥的北边堵他们,因为那是他们的必经之路.
We are to meet each other with them at the north end of the bridge.
双方约定好要在桥的北边见面.
be to do 还有很多情态用法,be going to do 没有以下用法.
You are to wash your hands before every meal.(表需要=need)
As Warrent's parents,you are to set a good example to him.(表责任,义务,相当于,must should)
Are we to clean the corridor,Mrs Dell? (表征求意见=shall)
The temperature is to drop soon.(表示可能性)
Would she get cross if I were to sail into her of lying?(表假设)
3.be about to do
意为"即将""就要""正要",指说完话后即做的事,时间上有很大的局限性,不能与具体时间状语连用,显然，这是与,be going to do和be to do 的区别.
We are about to leave.

你说的will/shall+do 我们把它看做一般将来时的谓语结构,表达将来某一时间发生的动作或所处于的状态.表示一种单纯的将来的含义，没有任何的计划性,目的性,和其他语气.
--Someone is knocking at the door?
-
-I will go and see who it is.
至于,be doing 是进行时态的谓语结构,在英语里,进行时态都可以表将来时态.但是要符合一定的条件.
一般是以下两条: be about to
01. 用现在进行时表一般将来时,限于动词,come go arrive start die等，表示即将发生的一个动作.
They are leaving tommorrow.
The foreign teacher is arriving on Monday.
02. 用来表示安排好要做的事情(用现在进行是结构表一般将来时含义)仅限于下列动词,do;give;have;leave;leave for;move;play;return;ride;sail;see;set forth;set off;set out;start;start for;stay;travel;visit;wear
The president is starting his state visit to Mexico Friday.
Which hotel are you staying in when you are in Tel Auiu?
当然，也可以用过去进行时来表达过去将来时,在这里不在赘述.

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