about后加介词to，be about to do即将做某事;正要做某事;刚要。

about后面跟to do或者doing。大多情况，后面跟doing。

about：

adv.大约;左右;将近;几乎;到处;处处；

prep.关于;对于;目的是;为了；

adj.在附近的;四处走动的;在起作用的;在流行中的

扩展资料

There was much discussion about the reasons for the failure.

就失败的原因进行了大量的讨论。

It was a difficult situation, when you think about it.

仔细想来，当时处境是很困难的。

The population is increasing at about 6% per year.

人口以每年约6%的速度增加。

It's only human nature to be worried about change.

对变革有忧虑不过是人之常情。

We estimated it would cost about 5 000.

我们估计要花费大约5000欧元。