on the apoint of和 be about to do ,be going to do ,be to do 区别?打错了,是on the point of

on the apoint of和 be about to do ,be going to do ,be to do 区别?打错了,是on the point of
on the apoint of和 be about to do ,be going to do ,be to do 区别?
打错了,是on the point of

on the apoint of和 be about to do ,be going to do ,be to do 区别?打错了,是on the point of
on the point of 即将,正要;就要...的时候
They were on the point of leaving when the phone rang.他们正要离开,这时电话响了.
be about to do 将要,正打算
They were about to leave when the phone rang.他们正要离开,这时电话响了.
上述两者意思相同,只是第一个是介词短语,第二个是动词短语
be going to do 1）如果主语是人,那它的意思是：打算好了做某事
2）如果是物作主语,那它的意思是：将要...
It is going to rain soon.要/快下雨了.
be to do 是按计划或安排要做的事,以及将来一定要做的事
We are to gather at the school gate at 8 tomorrow morning.我们订于明早8点在校门口集合.
This is to take place some day.这事总有一天会发生.

这四个短语都有表示即将要做或发生的事情，但（并同样以leave一词为例）：
on the point of doing sth.更强调在某个具体动作正要发生的那一刻，另一件事情发生了（两个动作几乎是同时发生的）－－－更强调一种巧合：
I was on the point of leaving the house late that afternoon when the phone ...

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这四个短语都有表示即将要做或发生的事情，但（并同样以leave一词为例）：
on the point of doing sth.更强调在某个具体动作正要发生的那一刻，另一件事情发生了（两个动作几乎是同时发生的）－－－更强调一种巧合：
I was on the point of leaving the house late that afternoon when the phone rang as it is always! 老是这样，每次当我离开房子〔可以指家，也可指任何一个房子〕的时候电话铃就会响起，那天下午就是这样的。
be about to do sth. 强调正要或正打算做某事的时候，另一件也事情发生了：
I was about to leave the house when phone rang. 在我正打算离开房子的时候，电话铃响了。
be going to do sth. 的确可以分两种情况，1）如果主语是人，则强调“打算、计划好了要做谋事”，口语中经常用”be gonna do sth“:
I'm gonna leave that house. 我要离开这座房子〔这个家〕。
2）如果主语指的是自然现象、天气或上文指的任何一件事情，则表示”某事将要发生了“：
It's going to be raining soon. (It's gonna be raining soon) 快下雨了！
而碰到有be to do sth.的选项的题目是则要特别注意 1）上下文（或整个句子的前后）是否有”已经计划好或打算过了要做的事情，而又必须得做的事情“ ；2）带有命令的口气：
1）I am to leave the house by the end of this month and someone else will take care of everything here like renting, selling or mortgage. 我这个月底就离开这个这个房子，会有别人来处理诸如出租、出售或抵押之类的事宜的。
2）What you're gonna do now is to leave that house immediately. 你所要做的就是给我马上离开这座房子！（这种情况还经常发生在大人训斥小孩：You are to go to bed right now! 给我赶快上床睡觉去！）

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