Basic Vowels
Learn the 6 basic Korean vowels: ㅏ, ㅓ, ㅗ, ㅜ, ㅡ, ㅣ
The six basic Korean vowels are the foundation of Hangul. Once you can identify ㅏ, ㅓ, ㅗ, ㅜ, ㅡ, and ㅣ on sight and pronounce each one consistently, every other Korean syllable becomes possible — every Hangul block contains at least one vowel, and learning these six first means you can already decode hundreds of common words before you even learn the consonants.
The trickiest of the six for English speakers is ㅓ, sometimes romanised 'eo'. It is not a diphthong — it is a single vowel that sits between English 'uh' and 'aw'. Japanese speakers usually have less trouble because Korean ㅗ and Japanese 'o' are close, but should still practice ㅓ carefully because Japanese has no direct equivalent. Pay particular attention to the mouth shape demonstrated in the audio examples; getting these vowels right at the start saves having to correct your accent later.
How Korean Vowels Work
Korean vowels are written with vertical (ㅏ,ㅓ,ㅣ) or horizontal (ㅗ,ㅜ,ㅡ) strokes. They always need a consonant to form a syllable — when a vowel starts a syllable, it uses the silent consonant ㅇ.
How It Works
The six basic vowels are not a random list — they sit on a grid defined by two things your mouth does: where the tongue sits, and whether the lips round. ㅣ is made with the tongue high and forward, lips spread. ㅡ is the same height but with the tongue pulled back and the lips still flat. ㅏ is the most open of the six, with the jaw dropped and the tongue low.
The pairs are where the system becomes obvious. ㅗ and ㅓ are made at nearly the same tongue height; the only difference is that ㅗ rounds the lips and ㅓ does not. ㅜ and ㅡ work the same way — ㅜ is ㅡ with rounded lips. This means four of the six vowels are really two pairs distinguished by lip shape alone, which is why a mirror is more useful than a diagram when you practise.
The written shape also tells you how the syllable block will be laid out. ㅏ, ㅓ and ㅣ are built on a vertical stem, so they stand to the right of the consonant: 가, 거, 기. ㅗ, ㅜ and ㅡ are built on a horizontal stem, so they sit underneath: 고, 구, 그. Once you internalise that, you can predict the shape of a block before you have finished reading it.
Where You'll Hear It
Because a vowel needs the silent ㅇ to stand alone, you can already read real words using nothing but this lesson's six vowels. 아이 means 'child' and is one of the first words learners see on signs at playgrounds and paediatric clinics. 오이 is 'cucumber' — you will find it on menus and on the side of almost every Korean banchan plate. 이 on its own means 'this' or 'tooth', depending on context, and shows up constantly in everyday speech.
ㅓ and ㅡ rarely stand as whole words, but they are everywhere inside syllable blocks. 어 opens 어디 ('where') and 어제 ('yesterday'), two of the most-used words in beginner conversation. ㅡ carries 그 ('that') and appears in the verb ending -습니다 that ends most formal sentences you will hear in announcements.
This is also the point where Korean signage stops being decoration and starts being readable. Subway stations, convenience-store aisles, and packaging all use these vowels heavily. Many learners report that the first genuinely motivating moment in Korean comes when they decode a shop sign without meaning to — and that moment is usually built on these six shapes.
Cultural & Language Note
Hangul was promulgated in 1446 under King Sejong, and the vowel shapes are not arbitrary. Each one is built from three symbols representing heaven (a dot, now a short stroke), earth (the horizontal line ㅡ), and a standing person (the vertical line ㅣ). ㅗ is the dot above earth; ㅜ is the dot below it. Once you see this logic, the vowels stop looking like random marks and start looking like a system — which is exactly what they are.
Common Mistakes to Avoid
The single biggest error is treating ㅓ as if it were ㅗ. They are different vowels and they distinguish real words: 어리다 (to be young) versus 오리 (duck). Learners who let these blur together early spend months undoing the habit. The second trap is ㅡ, which has no English or Japanese equivalent — it is not 'u'. Keep your lips flat and unrounded, as if you were saying 'ee' but pulling the tongue back.
How to Practice This Lesson
Practise in pairs, not in a list. Say ㅓ and ㅗ back to back in front of a mirror and watch only your lips — if they do not visibly round on ㅗ, the sound is not right yet. Do the same for ㅡ and ㅜ. Five minutes of this is worth an hour of reciting the six vowels in order.
Then write each vowel ten times while saying it aloud, and immediately combine it with ㅇ to make a real block: 아, 어, 오, 우, 으, 이. Finish by recording yourself reading 아이, 오이 and 이 and comparing against the lesson audio. Recording feels awkward but it catches errors your ear will not notice from the inside.