求解现在进行时和be about to表将来的用法及不同

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一般将来时 1)　shall用于第一人称,常被will 所代替.
　　will 在陈述句中用于各人称,在争求意见时常用于第二人称.
　　Which paragraph shall I read first.
　　Will you be at home at seven this evening?
2)　be going to +不定式,表示将来.
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.
The play is going to be produced next month.
c.有迹象要发生的事
Look at the dark clouds,there is going to be a storm.
3)　 be +不定式表将来,按计划或正式安排将发生的事.
We are to discuss the report next Saturday.
4)　be about to +不定式,意为马上做某事.
　　He is about to leave for Beijing
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
======以下答案可供参考======
供参考答案1:
be about to do表示将来表示那个未来时间和现在间隔短 可译为正要去做 而现在进行时表将来往往是e go这类词如 I am ing