grammar tenses :
Past
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~(으)ㄹ까 봐I'm worried about A, so 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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~잖아요You ought to know...
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반말체Informal Speech
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~거든요That's because...
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서술체Narrative form (Report Writing)
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~(으)ㄴ/는데도Although..., however...
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~(으)ㄴ/는 반면에While sth is true, (contrast)