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复数。both... and...连接两个并列成分（名词，代词等）。作主语时谓语动词用复数。例句：Both you and he are students.你和他都是学生。Both Jim and Lily are happy.吉姆和李莉都很开心。
both的用法
both用于系动词、情态动词和助动词之后，实义动词之前。
如；
1、We are both students.
=Both of us students .
2、We both like English.
=Both of us like English.
both相关例句
The data is limited in terms of both quality and quantity.
这份资料在质量和数量上都很有限。
They were both only 20 years of age.
他们两人都只有20岁。
They both had some right on their side.
他们双方都有一定的道理。