（1）act短语：
act as 担任……职务，起……作用 act for 代理（某人职务），代为（处理某事）
act out 表演（对话、故事等） act up 捣乱，出毛病
例如：
I acted as an interpreter while I was in Xiamen.
Mr Black is acting for the old man in his case. (布莱克先生代那个老人处理他的案件。)
The children were acting out the story of the birth of Jesus.
