Korean · Pronunciation Guide
do, one beat. Plain ㄷ with no aspiration, and a properly rounded 'oh' -- push the lips forward and hold them there.
do
One clitic beat, unstressed, hanging off the noun before it. Because 도 replaces the subject and object particles rather than stacking after them, it also reshapes the tail of the phrase -- 저는 becomes 저도, still two beats but with a different ending.
Listen: 도
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저도 같이 가요.
Jeodo gachi gayo.
I'm coming too.
Listen: 저도 같이 가요.
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저도 같이 가요 joins 도 straight onto 저 with no seam, jeo-do. And 같이 demonstrates one of Korean's palatalization rules: a ㅌ batchim in front of ㅣ becomes ch, so it is pronounced ga-chi and never 'gat-i'.
English speakers give this the diphthong of 'dough', gliding off into an 'oo'. Korean ㅗ is one steady rounded vowel with no movement in it. The other correction is aspiration -- a hard, breathy 'toh' makes it a different consonant, while the plain ㄷ after a vowel should stay soft and quiet.