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求一个英语高人among these i would list string and brown paper,kept

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/12 20:07:29
求一个英语高人
among these i would list string and brown paper,kept by thrifty people when a parcel has been opened,to save buying these two requisites.kept by ...这是个被动句吧,为什么kept前没有be动词啊
因为是非谓语,表被动时候直接用done,主动时态用 doing
非谓语动词是指在句子中不是谓语的动词,主要包括不定式、动名词和分词(现在分词和过去分词),即动词的非谓语形式.
-----------------例子,下面这句就是主动的,所以接上doing动名词
His habit,listening to the news on the radio remains unchanged.
他收听收音机新闻节目的习惯仍未改变.