are all什么时候用are看的是all前的名词,是单数或不可数名词用is,是名词复数,用are
如：We are all students.
They are all stars.
love is all around.
That is all.
are both什么时候用are理由同上
如：The children are both lovely.这两个孩子都很可爱.
They are both from Australia.他们两个都是澳大利亚人
Are you both from Japan?----Yes,we both are
这俩个词组,不用细致研究,跟all和both本身没多大关联.那请问：什么时候不用are呢？有些句子是不用用are的，例如；weall workhard。这里are跟all直接没什么必然联系，all可以直接用作副词，就像你说的