you are a good girl中间为什么用are 而不用is？

此处注意人称和be动词的搭配
I + am
you + are
he/she + is
例如：
I'm a good girl.
you are a good girl.
She is a good girl.

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is 用于第一人称单数，are用于第二人称单数。you是第二人称 单数，所以用are

扩展阅读：you work hard in school ... oh iread it last weekend ... you are good children ... was it interesting ... look at the elephant ... you are welcome ... agoda booking ... an ice cream for you ... you are good thank you ...