是he had sit down还是sat?为什么

楼上的真是在误人子弟...太不敬业了
应该是he had sat down 因为sit的完成时态是sat
he wasn't worry 是错的.应该是he wasn't worried或者he didn't worry
worry 是动词 worried才是形容词,或者是worry的被动语态.
楼主好像是对词性、语态不太清楚,找个语法书好好看看完成时、被动语态这2个章节就OK了