Korean · Pronunciation Guide
da, one open beat. Plain ㄷ with no breath behind it, and a wide 'ah' vowel.
da
A single unaccented beat. As an adverb meaning 'all' it sits directly before a verb and shares that verb's phrase contour; unlike English 'all', it does not attract emphasis, and stressing it makes a plain statement sound insistent.
Listen: 다
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다 했어요.
Da haesseoyo.
I did everything.
Listen: 다 했어요.
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다 했어요 puts 다 in front of 했어요, and the ㅆ of 했 resyllabifies into 어 to give hae-sseo-yo with a full double s. The short adverb and the longer verb form a single two-word phrase spoken without any pause between them.
The temptation is to lengthen the vowel for emphasis -- 'daaa haesseoyo' -- which does not work in Korean, where duration is not the emphasis device it is in English. Keep it clipped. Aspirating the consonant into 타 is the other slip, and that is an entirely different word meaning 'to ride'.