be about to do表示正准备做某事但还没来得及做,后面跟的when解释了打断原本要做的那件事情的原因。 例句:I was about to go swimming when he called me to go back to the company. (我正打算去游泳的时候,他突然打电话叫我回公司。)
be on the point of doing when...表示在做某事的时候突然又发生了另一件事。 例句:I was on the point of driving when the cellphone rang suddenly. (我正开着车的时候手机突然响了。)追问
be about to do sth= be on the point of doing sth正要做某事 when (就在那时) when+从句 be about to do when...=be on the point of doing when... 正要.....就在那时.... 如; 我正要出门,就在那时电话铃响了。 I was about to leave when the telephone rang. I was on the point of leaving when the telephone rang.本回答被网友采纳