Thai vowels —
32 forms, 18 sounds

In English, reading is linear: you go from left to right, letter by letter. A vowel always follows a consonant (ba, bi, bo) or precedes one (ab, ib, ob). In Thai it works differently.

A Thai vowel can appear in four positions around a consonant. The vowel า (aa) goes to the right: กา (kaa). The vowel ิ (i) goes above: กิ (gi). The vowel ุ (u) goes below: กุ (gu). The vowel เ goes to the left of the consonant: เก (gee) — even though you write the consonant after it. Some compound vowels have parts both left and right of the consonant.

This requires reading a syllable as a visual whole, not linearly. Once you do that — and it only takes a few weeks of practice to automate — Thai reads surprisingly fast.

The 32 forms sometimes sound more complicated than they are: most are long/short pairs of the same sound. า (aa) is the long version, ะ (a) the short. ี (ii) is long, ิ (i) short. ู (uu) long, ุ (u) short. If you know the 18 basic sounds, you already know half of the 32 forms.

In Thai, vowel length is phonologically relevant: it affects not only the sound but also the tone. A long vowel in a closed syllable behaves differently in the tone system than a short vowel in the same syllable. This is one of the more advanced aspects of Thai, but it is good to keep in mind.

As a beginner, the practical lesson is simple: always learn vowels with an example word. Not just the character and the sound, but also the word and the tone. That way you learn vowel duration implicitly, without having to think about it separately.

Learn vowels always alongside consonants, never as a separate topic. A vowel on its own is abstract; a vowel in a word is concrete. กิน (gin = to eat), ดี (dii = good), มา (maa = to come) — in that context you remember the form, the position and the sound all at once.

Pay extra attention to the left-positioned vowels like เ, แ and โ. It feels unnatural to read a character on the left that belongs to the consonant on its right — but you get used to it quickly. Practise deliberately with words like เก่า (old), แมว (cat) and โต (to grow) until it becomes automatic.

Be aware of the difference between vowel forms and tone markers. Above a consonant, both a vowel (ิ, ี, ึ, ื) and a tone marker (่, ้) can appear — or both at once. Train your eye to distinguish them: vowels are thicker and fuller in shape; tone markers are small and ornate.

In Pasaa you learn vowels always in the context of real words and sentences. The FSRS repetition ensures you remember vowel forms permanently, while native audio teaches you the correct pronunciation and vowel duration without having to measure it consciously.