The preposition 在: where an action happens
From the lesson “My father also works at a hospital”
Structure
Subject + 在 + Place + Verb (+ Object)
介词“在”和表示位置、处所的词语组合,在动词前,表示在什么位置、处所做什么。 在 + place goes before the verb to say where something is done: 我在学校吃午饭 (I have lunch at school). In English the place comes at the end; in Chinese it comes before the verb.
Examples
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我在学校吃午饭。
Wǒ zài xuéxiào chī wǔfàn.
I have lunch at school.
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他爸爸在医院工作。
Tā bàba zài yīyuàn gōngzuò.
His father works at a hospital.
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你在哪儿买菜?
Nǐ zài nǎr mǎi cài?
Where do you buy vegetables?