形容词后缀——
"-ed" = a person' feeling
"-ing" = something gives a person this feeling
即，“-ed” 形容的是“一个人的感受”，而“-ing”形容的是“给人这种感受的事物”。若形容词修饰“人”，则用“-ed”，若形容词修饰“事物”，则用“-ing”
例如——
It makes me feel excited.
（excited = My feeling）
Working hard all day is tiring.
（tiring = Working hard gives me this feeling）
Sarah looked confused.
（confused = Sarah' feeling）
I had an annoying day.
（annoying = The day gives me this feeling）