哪儿
nǎr
where?; wherever; anywhere; somewhere
In a story
家里边没有小白,它在哪儿呢?Xiaobai wasn't anywhere in the apartment — where was she?我的猫不见了 · The Cat Is Gone · HSK 1
王静笑了:“你是我的朋友吧?你在哪儿?”Wang Jing laughed. “You're one of my friends, aren't you? Where are you?”星期天的电话 · The Call From Sunday · HSK 1
Grammar with 哪儿
说到/想到哪儿去了
说到哪儿去了 — you've got quite the wrong idea
从
从 — from (a starting point)
反问句
反问句 — rhetorical questions (for emphasis)
疑问代词的非疑问用法
谁/什么/哪儿… — non-question (any / every) uses

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