I (was about to ) go out when someone knocked at the door 为什么不用was going to

问题描述:

I (was about to ) go out when someone knocked at the door 为什么不用was going to

was about to跟有时间点的感觉,就是说我“刚好”要出去的时候。。。

be about to…when…固定搭配,“正要做…突然…”

be about to 和be going to都是表示将要的意思
但是be about to 将要的程度更要近点,也就是马上的意思
翻译:我正准备出门,这时,有人敲门了!