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Your sentence
你
Words in this sentence
你
you (informal, as opposed to courteous 您 (nín)); you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)
在
to exist; to be alive; (of sb or sth) to be (located) at; (used before a verb to indicate an action in progress)
哪儿
where?; wherever; anywhere; somewhere; (used in rhetorical questions) how can ...?; how could ...?