grammar level :
Intermediate
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~다고요?(What) did you just say?
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~(으)ㄹ까 봐I'm worried about A, so B
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~고 해서A is one of the reasons why B
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~(으)ㄴ/는 탓에Because this happened... that (bad thing) happened...
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~는 바람에As a consequence of...
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~느라고Because of that...sth negative
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~잖아요You ought to know...
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반말체Informal Speech
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~거든요That's because...