In one of my lessons, in response to asking if they had an umbrella they responded "우산 없어요." They asked "그럼 이것은요?" I don't understand why they used 은 instead of 이 or an object particle.

  • In short, you have to use 은/는 when you change the topic.
    – Klmo
    Commented May 9, 2020 at 2:17


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