looking （look的现在分词）；用于现在进行时。例：Why is he looking so sad?他为何看上去如此凄伤?What is he looking at, then?那么他到底是在看什么？
He is looking at someone.他正在看着某个人。
looked （look过去式，过去分词）用于一般过去式例：They looked at each other.他们目光相互对视。
She looked in on her friend on her way home她在回家的路上顺便看看朋友。
