grammar tenses :
Past
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~(으)ㄹ지도 모르다You don't know if...
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~(으)ㄴ/는/(으)ㄹ 줄 몰랐다(알았다)I hadn't realized / I had thought...
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~(으)ㄹ걸요Prob'ly (informal)
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~(으)ㄹ 테니까Since it might...you should
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~(으)ㄹ 텐데I would imagine...
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~(으)ㄴ/는 모양이다I guess...
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~아/어 보이다Looks like / seems like