Learn how ㅂ, ㄷ and ㅅ at the end of some verb and adjective stems change before -아요/어요, like 매워요, 들어요 and 지어요.
By the end, you can change ㅂ, ㄷ and ㅅ irregular words into the 해요 form and the past form. You can also tell them apart from regular words that look the same, like 입어요, 닫아요 and 씻어요.
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