as busy as a bee 忙忙碌碌
see the elephant 得到严重的教训
white elephant 沉重的包袱
talk horse 吹牛
duck’s egg 鸭蛋,零分
a sleeping dog 别多事
teach fish to swim 班门弄斧 多此一举
kill two birds with one stone 一石二鸟
Every dog has his day 风水轮流转
When pigs fly 不可能的事
Love me,love my dog 爱屋及乌
When the cats are away,the mice will play 狸猫不在,老鼠闹债