about后加什么形式

about是介词，后面一般加名词，或动名词；

prep.(介词)+动名词，就是的V-ing形式

about

adv.大约;左右;将近;几乎;到处;处处;各处；

prep.关于;对于;目的是;为了;涉及…方面;忙于;从事于；

adj.在附近的;

He doesn\'t like to talk about his private life.

他不愿谈及他的私生活。

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。