请问 怎么区分主语?例如:In came a man with a white beard.是倒装结构,那原句是什么?

问题描述:

请问 怎么区分主语?例如:In came a man with a white beard.是倒装结构,那原句是什么?

a man with a white beard came in

是倒装结构.原句:A man with a white beard came in.