i think I must study English hard .영어공부를 열심히 해야합니다
2011年4月18日
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Plus, it gives a nuance about following meaning.
I think I must study English hard. (But I am not sudying/cannot study it.)
(나/너/우리는) 영어공부를 좀 해야하는데...(못/안하고 있다.)
2011年4月27日
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i think I must study English hard .영어공부를 열심히 해야합니다.