"We needn't guard against one who calls himself a thief,but we should watch out for one who calls himself an upright gen
问题描述：
"We needn't guard against one who calls himself a thief,but we should watch out for one who calls himself an upright gentleman."在这句话里能不能直接用watch out one?for起什么作用啊?
答
你可以说Watch out!小心!,但是后面跟宾语的时候要加上介词for,这是固定搭配.