英语fit 既可以当动词,又可以当形容词,那什么时候用动词fit,什么时候用be fit ,be fit for呢.请

动词：
fit sb适合于某人
如：
The pair of shoes fits me well.
以下为形容词
be fit合适
They are fit,but I do not like the colour.Have you got them in a dark brown
这双大小较合适,但我不喜欢这种颜色.这种鞋有棕色深一点的吗?
be fit to do
意为“适合于做某事”.
Only such carriers are fit to supportfighter jets that can fly long-range missions with heavy payloads.
只有此类航母才适合为那些能够携带大量弹药、作战半径也较大的战斗机提供支持.
be fit常与for连用.
适合（于）,对……合适；胜任
An artist shall is fit for the best societyand keep out of it.
艺术家应该适合最高阶层社会而又应置身于外.
keep fit
保持（身体）健康
We can keep fit by going in for exercise.
我们可以通过参加体育锻炼来保持健康.这件短裙很适合我，the skirt is fit for me very well . the skirt fits me very well.这两种表达都对吗是的，都可以的。但is fit for me就行了，不加very well建议在be fit for前加quiteThe skirt is quite for me.The coat is fit for me.这件衣服合我的身。This jacket fits me well.这件夹克适合我。