are your brother in the lab?这句话对吗

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are your brother in the lab?这句话对吗
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are your brother in the lab?这句话对吗
are your brother in the lab?这句话对吗

are your brother in the lab?这句话对吗
不对的,主语是your brother,不是you,所以用is而不是are
Is your brother in the lab?

错,Is your brother in the lab?