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‘-을/ㄹ 때’ is used to show the moment when a certain event happens or a certain action/state is continuing. It is placed after a verb or adjective.
● 가족하고 함께 있을 때 행복해요. (I am happy when I’m with my family.)
● 저는 공부할 때 음악을 들어요. (I listen to music when I study.)