all that can be done has been done为什么用HAS

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all that can be done has been done为什么用HAS
all that can be done has been done
为什么用HAS

all that can be done has been done为什么用HAS
all修饰that,没有出现复数形式,所以用has

能做的都已经做了
all作代词，表全体、一切、全部，则动词一般都是用单三

这里你或许没理解，All that 这种结构后面是跟动词的单数形式的，不是复数形式,你从中文来看好像是所有东西都使用了，是复数的意思，但是在英文结构上你没看到任何有复数的名词形式，你是用动词单数的。但是，比如你用了All methods/approaches(方法）that can be done则后面用have been done，因为前面采用了名词的复数形式。
另外比如everythi...

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这里你或许没理解，All that 这种结构后面是跟动词的单数形式的，不是复数形式,你从中文来看好像是所有东西都使用了，是复数的意思，但是在英文结构上你没看到任何有复数的名词形式，你是用动词单数的。但是，比如你用了All methods/approaches(方法）that can be done则后面用have been done，因为前面采用了名词的复数形式。
另外比如everything, nothing, anyhing, anything, nobody, anybody, somebody, someone, everyone等不定代词，后面也是用动词的单数形式的

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all在这里表示一个整体的概念，所以用单数has.
for example:
1 all is right.一切顺利。
2 ten yuan is enough. 十元够了。

all that = what，引导主语从句。

因为主语是代词all，强调一个整体

all that can be done has been done. all that can be done been done.why is all that?没有that不行吗? all that can be done has been done.中的that为all that can be done has been done.中的that为什么不能用which替换? all that can be done has been done为什么用HAS all that can be done has been done 为什么要用has,不用have All that can be done __been done.请问该用has还是 have? They won't leave until all that can be done is done 合并句子all can be done.all must be done _ can be done has been done.A.All B.All that C.All what D.Anything They came to the conclusionn.________ by a computer.A.that not all things can be done B.because of not all things be doneC.being not all things can be done D.because not all things can be done 19.All that can be done .　　A.have been done B.have done C.has been done D.has done顺便,翻译一下这句话吧 that,can,be,all,that,done,is 组句 并说出意思 all ( ) can be done must be done.A.that B.which C.who D./如题,说明理由 can be done has been Everything that can be done has been done 中can be done has been done All that can be done___A.have been done B.have done C.has been done D.has done为什么选C怎么解释? All that can be done___________A.has done B.has been done C.have done D.have been done 请选入合适的选项.并解释原因, —How are things getting on?—All that can be done____.A.has been done B.have been done C.has done D.have done All that can be done is to convert energy from one form into another.