【问】 be about与be on the point of在语义上有无区别?

【答】 它们在语义上并没有什么区别，都表示最近的将来(正要，刚要)。但是，在语法上，beabout应与带to的动词不定式连用，而be on the point of则必须接动名词。

1. He was just about to dive when he saw the shark. (PEG)

他刚要跳水，突然看见了鲨鱼。

2. He fears that he is about to have a heart attack. (EDECT)

他害怕心脏病要发作。

3. The roof seems on the point of falling in. (ECD)

屋顶眼看就要塌下来了。

4. I was on the point of communicating with him by paper. (EDECT)

我正要写信跟他联系。