be going to ,will ,be about to,的区别 是什么 谢谢

1) Will 强调主观意愿,即纯粹的“将”.在陈述句中用于各人称,在征求意见时常用于第二人称.
Will you be at home at seven this evening?
Which paragraph shall I read first?
2) be going +不定式,表示主观打算、计划、安排或根据迹象主观判断将发生.表示要发生的事情,有了预先的计划、准备要做或根据主观判断,有迹象表明
肯定将会发生.
a.主语的意图,即将做某事.
What are you going to do tomorrow?b.计划、安排要发生的事,是主观安排.
The play is going to be produced next month.
I'm going to play football tomorrow afternoon.(主观安排,如我只是和朋友约了明天下午踢足球以消遣时间,可去可不去,可由主观决定) c.有迹象要发生的事
Look at the dark clouds,there is going to be a storm.It is going to rain soon.快要下雨了.
He's very ill.I'm afraid he's going to die.他病得厉害,我恐怕他将要死了.
3) be +不定式,表示按照计划或正式安排将发生的事,主要是指客观安排、必然趋势.
We are to discuss the report next Saturday.
I am to play football tomorrow afternoon..(客观安排,如这儿有场比赛定在明天下午,不去不行,不能由主观决定)
The students are to meet at the school gate tomorrow.明天学生们将在学校大门口集会.
4) be about +不定式,意为马上做某事,在时间上指最近的将来,不能再加表示明确将来时的时间状语.
He is about to leave for Beijing.We are about to start.
We are about to start immediately.
注意：be about to 不能与tomorrow,next week 等表示明确将来时的时间状语连用.
——寒冰烈