用is 因为不能用前面的and 链接he 和she ,因为这里是否定句,我既不知道he 也不知道she 所以如果说2个都不知道就是 i dont know who he or she is, 也可以说i dont know who he is, nor who she is
直译:
I don't know who he is and who she is.
简洁并习惯说法:
I don't know who they are.
就因为你的提问的这种原因,人们一般不说
I don't know who he and she is/are.
或
I don't know who's he and she.
希望帮到了你,满意敬请采纳,谢谢。
I don't know who is him and her.
is