he has finished the work改为被动语态（he studies very hard变否定句）

he has finished the work被动语态是

The work has been finished by him

现在完成时的被动结构为have/has been done

例如，The workers have built the bridge over the river in the last week .被动语态为The bridge over the river had been built by the workers in the last week .

英语语法中，主动句，被动句，是经常转换的句型，类似于汉语中的把字句和被字句。he has finished the work变成被动语态，即the work has been finished by him.工作work做了主语，没用生命的名词，需要用被动语态，工作被....完成，be done，动词要用过去分词形式。