be sorry for 、be sorry about、be sorry to do三者的区别,可以说得清楚点吗,尽可

e sorry for 大多数是为自己的过失而抱歉,或感到遗憾.
be sorry about 针对未必和自身相关的某个事件
be sorry to do ...比较空泛,后面动词可随意变化
sorry to see .../sorry to hear ...都表达遗憾