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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.)
是
to be (followed by substantives only); correct; right; true; (respectful acknowledgement of a command) very well; (adverb for emphatic assertion)
什么
what?; something; anything
时候
time; length of time; moment; period
来
to come; (used as a substitute for a more specific verb); hither (directional complement for motion toward the speaker, as in 回来 (huílai)); ever since (as in 自古以来 (zìgǔyǐlái)); for the past (amount of time); (prefix) the coming ...; the next ... (as in 来世 (láishì)); (between two verbs) in order to; (after a round number) approximately; (used after 得 (dé) to indicate possibility, as in 谈得来 (tándelái), or after 不 (bù) to indicate impossibility, as in 吃不来 (chībulái))
的
of; ~'s (possessive particle); (used after an attribute when it modifies a noun); (used at the end of a declarative sentence for emphasis); (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 (pígéde) "one made of leather" or 跑堂儿的 (pǎotángrde) "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 (xīnde) "new one"); also pr. dì or di in poetry and songs
Particle