about后面加什么形式?

bout是介词，后面一般加名词，或动名词；

bout

n. 一阵;一场;(尤指坏事的)一通，一次;(疾病的)发作;发病期;拳击(或摔跤)比赛

The karate bout has many similarities to a boxing match.

空手道比赛和拳击比赛有许多类似的地方。

I just felt the need to write bout it, I guess.

我想我就是觉得有必要对此写点儿什么。

The latest bout of violence has claimed twenty four lives

最近发生的`一起暴力事件造成24人死亡。

This will be his eighth title bout in 19 months.

这将是他19个月里的第8次卫冕赛。

A half-hour daily walk can be more beneficial than one hard bout of exercise a week.

每天散步半小时会比一周剧烈运动一次对身体更有益。