Note
for typing it is either that you push longer on the ㄷ button or you have to use shift ㄷLet's review 3 characters:
ㄷ (about 2-3 cm of your tongue touch the palate just behind your front teeth)
ㅌ ( tongue tip touches about a cm behind the front teeth. Much air comes from your mouth)
ㄸ (strong d sound, but no air comes out of your mouth, as if the sound goes inward your mouth )
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We have an entire course teaching Korean grammar and vocabulary.