being done是什么时态
being done的时态是：He is doing his homework.他正做作业。不强调主语，强调宾语，将该句变为被动语态是His homework is being done。他的作业正进行中。如果现在完成时的主动语态是He has done his homework。他已做完作业。
being done的时态是：He is doing his homework.他正做作业。不强调主语，强调宾语，将该句变为被动语态是His homework is being done。他的作业正进行中。如果现在完成时的主动语态是He has done his homework。他已做完作业。
如果将该句变为被动语态就是:
His homework has been done.他的作业已经做完了。
done是过去分词，作为非谓语动词，单独使用作独立主格结构，对主句的谓语起到被动完成的作用。
His homework done, he went out to play.（=After he had done homework, he went out to play.）作业写完后，他出去玩了。
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