Usages of jettae
도서관 책은 직접 제때 반납해야 해.doseogwan chaegeun jikjeop jettae bannaphaeya hae.
You must return library books yourself on time.
숙제를 제때 제출했어요.sukjereul jettae jechulhaesseoyo.
I submitted the homework on time.
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We have an entire course teaching Korean grammar and vocabulary.