What is hard, and what is not
The difficulties are all at the front. Thai has five tones, and a word said with the wrong one is a different word or no word at all. It has short and long vowels that change meaning, and consonants English does not split the way Thai does, such as the unaspirated p of ปา against the aspirated ph of พา. And it has its own script, written without spaces between words.
Behind that front the language is kind to learners. Verbs never change their form: ไป pai is go, went and gone. Nouns have no plural ending and no gender, there are no articles, and time is shown with words like แล้ว láeo (already) and จะ jà (will) rather than with tenses. Sentences are built in an order English speakers recognise: subject, verb, object. Once you can hear and say the sounds, vocabulary is the main job.
Script first or sounds first?
There are two good answers. One school says to listen for months before you read or speak, so that your ear is formed by real Thai rather than by spelling; the AUA language centre in Bangkok built its Thai programme for foreigners on that idea in the 1980s. The other says to learn the script in the first weeks, because it is the most precise record of the sounds you will ever have.
For most adults studying part time, the second works better, as long as you listen from the first day too. Thai spelling, unlike English, tells you almost exactly how a word sounds, tone and length included. Romanisations do not: the official RTGS writes ข้าว (rice), ข่าว (news) and ขาว (white) all as khao. If you learn words from romanisation you learn them without their tones, and unlearning that takes longer than learning the alphabet.
A practical order: the nine mid-class consonants and the long vowels first, so you can read real syllables in the first week; then the high and low classes; then the tone marks and the tone rules. Learn each letter with its name word, as Thai children do: ก ไก่, ข ไข่, ค ควาย.
Getting the tones
- Hear them before you try to say them. Adults can learn to hear new tones with training; the research summary explains what kind of practice helps. Listen to pairs of words that differ only in tone, from several speakers, and test yourself.
- Learn every word with its tone, from audio or from the Thai spelling, never from a romanisation without tone marks.
- Say whole phrases. Tones in connected speech are shorter and flatter than in words said alone, and sentence intonation sits on top of them; the prosody guide covers how.
- Record yourself and compare with a native speaker. You will hear mistakes in a recording that you cannot hear while speaking.
What kinds of resources help
- A course with audio for the backbone: a sequence of grammar and vocabulary you do not have to plan yourself. Pick one that teaches the script.
- A good dictionary that shows tones. The resources list names the standard ones.
- Lots of listening at a level you mostly understand: learner podcasts, then Thai video with Thai subtitles. The listening guide has a plan.
- Stories and graded reading once you can read slowly; see learning with stories.
- Spaced repetition for vocabulary and for the alphabet itself; see Anki for Thai.
- A teacher or conversation partner, sooner than feels comfortable. Thai is spoken quickly and with a lot left out, and only a person can show you that.
How long it takes
Honest numbers are rough. The US Foreign Service Institute plans about 44 weeks of full-time study, some 1,100 class hours, to bring an English speaker to professional working proficiency in Thai; that is the same group as Russian or Vietnamese, and about half the time it plans for Japanese or Arabic. Most learners have an hour a day at best, so the calendar stretches accordingly.
At that pace, a reasonable expectation is: the alphabet in a month; ordering food, asking directions and simple small talk after three to six months; comfortable everyday conversation on familiar topics after one to two years, faster if you live in Thailand and use the language every day. Reading a newspaper takes longer, because written Thai uses a more formal vocabulary than speech.
A plan for the first three months
- Weeks 1 to 4: the consonants and vowels, about five letters a day, with their name words. Fifteen minutes of listening a day to a course’s audio.
- Weeks 5 to 8: the tone rules, applied to every new word. Start a vocabulary deck. Learn the polite particles and fifty everyday phrases by heart, with their tones.
- Weeks 9 to 12: read short texts slowly, out loud. Add a weekly conversation lesson. Start typing Thai, which drills the letters again; the on-screen keyboard works without installing anything.
The mistakes that cost the most time
- Learning words from romanisation. Covered above; it is the most expensive habit to undo.
- Treating vowel length as a detail. It changes words as surely as tone does: เข้า khâo (to enter) against ข้าว khâao (rice).
- Hearing g and d where Thai has unaspirated k and t. ก and ต are not English g and d; the sound comparison sets them out.
- Saying final consonants English-style. Thai k, t and p at the end of a word are not released: นก is nók with the k held, not “nokh”.
- Waiting until you are ready to speak. Nobody is. Speak early, with a patient partner, and let them correct you.
- Learning only the Thai foreigners hear. Shop and taxi Thai is a narrow slice. Listen to Thais talking to each other as soon as you can follow a little.