Everything can be done has been done.请问这里can be done 用的是什么时态?是被动句吗?

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• Everything can be done has been done.请问这里can be done 用的是什么时态?是被动句吗?请求分析这句句子：Everything can be done has been done.请问这里can be done 用的是什么时态?是被动句吗?这里has been done用的是什么时态?是被动句吗?
• Has all that can be done been done?为什么用HAS 不用 HAVE PEOPLE也是整体,动词用复数先换成陈述句＝all that can be done has been done主语＝all 定语＝that can be done谓语＝has been done（被动）转换成简单的主句＝all has been doneall 作为一个整体,集合名词所以用单数我的意思是为什么用HAS 不用 HAVE PEOPLE也是整体，动词用复数 that为主语的话，无论that指的是单数还是复数，谓语动词都要用单数？
• Everything can be done has been done.请问这里can be done 用的是什么时态?是被动句吗?
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• nothing that can be done has been done 可省that吗