What does 거야 mean and how to use it?
I hear it often in songs and just curious as to what it means and how would I use it. I've already googled it and all the explanations are extremely confusing.. Like they'd give 2 samples and 1 would mean "do you love me?" but the other would say "i'm going to clean my room" or something. I don't see any similarities between these.. :L Please explain as simple as you can. Thanks!

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Thank you. :))

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거야 is just a way or style of saying things.
When you decide something to do and say it aloud; 나 오늘 공부할거야. 나 이제부터 운동할거야. 엄마가 나를 데리러 오실거야.

When you ask something for clarification or scolding; 너 자꾸 이럴거야? 너 계속 장난칠거야? 어제 도서관에 갔던거야? 아까 어디 있었던거야? 오늘 축구 할거야?

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거야 is "be going to or will"in English.
so, it has nothing to do with Question("Do you love me?").