改错:David and Helen are sister and brother

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改错:David and Helen are sister and brother

改错:David and Helen are sister and brother
改错:David and Helen are sister and brother

改错:David and Helen are sister and brother
改为:David and Helen are brother and sister

David and Helen are sisters and brothers.
不知道对不对。

David and Helen are sister and brother,去掉and brother..

David and Helen are brother and sister.
因为David是男的,Helen是女的,所以要对应起来。

are brother and sister.

David and Helen are sisters and brothers.复数对应一致。