Lauren explained it well. I think the main reason is because it's easier to say. Sometimes in English songs, there are lyrics that say "got you" or "miss you," and a lot of times it sounds like "got choo" and "miss shoo." It's easier for our mouths to say "miss shoo" than to distinctly say "miss you" and I think it's the same way in Korean. Korean especially seems to be a lot about making words flow the best, so that's why 붙이다 and 같이 sound like they have a ch sound. I hope that makes sense!

I think it is because the symbol 'ㅌ' is followed by a 'ㅇ' and so it produces a 'ch' sound.. (sorry I didn't explain that very well..) But, another example is the word 'together'-- '같이' is pronounced 'ga chi'. ^^ haha I hope that was somewhat helpful >.<

Actually, modifications to the pronunciation of 'ㄷ' and 'ㅌ' occur quite often! Adara is right that it is being used for the ease of pronunciation. But there is a simple rule when does this sound change take place. It changes in front of '이' or diphtong '여' : 1) 'ㄷ' is pronounced as 'ㅈ' 2) 'ㅌ' is pronounced as 'ㅌ'. For example : 맏이 ---> [마지] 같이 ---> [가치] 끝이 ---> [끄치] 붙이다 ---> [부치다] 붙여요 ---> [부쳐요] A more complicated case, which you can face with, involves 닫혀요 (being closed), which is being pronounced as 다쳐요 (the same as 'get hurt') You would probably ask - "Why? The second syllable in the word 닫혀요 is '혀', not '여"! Two things happen there. First, the combination of 'ㄷ' with 'ㅎ' in 닫혀요 results in 'ㅌ' (you know that simple rule, right? 'ㄱ' + 'ㅎ' = 'ㅋ' ; 'ㅂ' + 'ㅎ' = 'ㅍ' and so on) Second, this 'ㅌ' pronouced as if it was 'ㅊ' because of the following '여'. So, basically - 닫혀요 >>> 닽여요 >>> 다쳐요 Hope it helps!

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