ㄷ generally sounds more like T at the beginning or end of a word, more like D in the middle. (Compare 다 to 어디) ㄹ generally sounds more like R at the beginning, more like L at the end. In the middle of a word, pronunciation varies from person to person; some people say closer to "salang" other people say "sarang," etc. (Compare 라면/알아요 to 제발.) ㅂ generally sounds more like P at the beginning or end of a word, more like B in the middle. (밥 illustrates the sound of ㅂ at both the beginning and end, 이별 in the middle)

(ㄷ = D) (ㅌ = Th) (ㄸ = T) (ㄹ= R - in the beginning of word) (ㄹ= L - in the end of word) (ㅂ = B) (ㅃ = P) (ㅍ = P)