1
be about to do sth
表示动作即将发生，后接动词原形。
The train is about to leave.
火车即将出发。
即将
先理解核心含义，再看它在真实句子里的用法。
即将；正要
The train is about to leave.
火车即将出发。
I was about to leave for work when the phone rang.
我正要出门上班时，电话响了。
We were about to start dinner when the doorbell rang.
我们正要开始吃晚饭时，门铃响了。
She is about to make an important decision about her career.
她即将对自己的职业生涯做出一个重要决定。
表示动作即将发生，后接动词原形。
The train is about to leave.
火车即将出发。
用于被动语态，表示某事即将被做。
The results are about to be announced.
结果即将被公布。
否定形式表示不打算或不愿意做某事。
I'm not about to apologize.
我不打算道歉。
Not this
She is about to leave for Beijing tomorrow.
Use this
She is about to leave for Beijing.
about to 表示即将发生的动作，不能与明确定义未来时间的状语（如 tomorrow）连用。应去掉时间状语或改用 going to。
Not this
I am about to went to school.
Use this
I am about to go to school.
about to 后接动词原形，不能接过去式（went）或现在分词。应改为动词原形。
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用于be动词之后，后接动词原形
Dictionary facts from ECDICT.