主语是I时用am 过去时用was
主语是单三的就用is was
主语是复数就用are were
been done 适用于被动语态
have.has been done这个是现在完成时的被动形式,根据主语不同用have或是has
如您认同,好评+采纳哦
英语主谓一致什么时候用am.is.was .are.were been done
1个回答
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