nae banryeodongmureun goyangiinde, natseon soriga namyeon sumneun pyeoniya.

My pet is a cat, and she tends to hide when she hears unfamiliar sounds.

Breakdown of nae banryeodongmureun goyangiinde, natseon soriga namyeon sumneun pyeoniya.

• 이다: to be
• ~가: subject particle
• ~은: topic particle
• ~면: if

Questions & Answers about nae banryeodongmureun goyangiinde, natseon soriga namyeon sumneun pyeoniya.

Why is 내 반려동물은 using 은/는 instead of 이/가?

은/는 marks the topic (what you’re talking about in general). Here, 내 반려동물은 sets up the topic: as for my pet…
You could use 이/가 if you were introducing it as new, specific information or emphasizing it, but the sentence naturally reads like a topic-comment structure:

• 내 반려동물은 … (topic)
• 고양이인데, … 숨는 편이야 (comment about it)

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What does 인데 mean in 고양이인데?

인데 is the connective form of 이다 (to be) and often means and / but / (by the way) it’s… depending on context.
Here, 고양이인데, links it’s a cat to the next clause and feels like It’s a cat, and (as for behavior)… or It’s a cat, but (it does this)….

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How is 고양이인데, different from 고양이야.?

• 고양이야. = a complete sentence: It’s a cat.
• 고양이인데, = not finished; it expects another clause: It’s a cat, and/but…

So 인데 is used because the speaker immediately continues with extra information.

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Does 인데 imply contrast like but?