what are you doing 为什麽be动词要用are

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what are you doing 为什麽be动词要用are
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what are you doing 为什麽be动词要用are
what are you doing 为什麽be动词要用are

what are you doing 为什麽be动词要用are
因为主语是you .

因为是第二人称,所以用are

因为主语是you, you are....