Pronouns and Dropping the Subject
Thai has many pronouns chosen by age, status and gender, and leaves them out entirely whenever context makes them obvious.
Which I do you mean?
English has one word for I. Thai has a shelf of them, and picking one says something about you and about the person you are talking to. phom (ผม) is the standard polite I for men. chan (ฉัน) is the standard for women, with dichan (ดิฉัน) as its formal version. rao (เรา) means we, but is also used casually for I among friends. Many Thais simply use their own nickname where English uses I, especially women and younger speakers, and it sounds warm rather than childish. As a learner you need exactly two: phom or chan, matched to your gender. Everything else you learn by ear over time.
You, and how to avoid it
khun (คุณ) is the safe polite you, and also the title in front of a name: khun Somchai. It works with strangers, shopkeepers and colleagues. Beyond that, Thai prefers kinship words to pronouns. Someone roughly your parents' age is pa (ป้า, aunt) or lung (ลุง, uncle). Someone a bit older than you is phii (พี่). Someone younger is nong (น้อง). Using these is not familiarity, it is ordinary courtesy, and calling a waitress phii is completely normal. There is a blunt you, mueng (มึง), that comes with a matching blunt I. Recognise them so you know what you are hearing between close friends, and do not use them.
Leaving the subject out
Thai drops any pronoun that context already supplies, and does it far more aggressively than English. Once it is clear who you are talking about, that person simply stops being mentioned. Asked 'have you eaten yet?', the natural answer is 'eaten already' with no I in it. Asked 'where are you going?', the natural answer is 'going to the market'. Putting phom or chan into every sentence is grammatically fine but sounds heavy and slightly foreign, like someone repeating your name in every line of a conversation. The practical rule: state the subject when you introduce it or when you change it. Drop it while it stays the same.
He, she, it, they
khao (เขา) covers he and she, with no gender distinction at all. Context tells you which. man (มัน) means it, used for animals and things, and is rude for people. phuak khao (พวกเขา) is they, though khao alone often covers it too. Because khao does not mark gender, Thai speakers translating into English mix up he and she constantly. It goes the other way as well: you do not need to decide the gender of the person you are talking about, which is occasionally a relief. phuak (พวก) in front of a pronoun pluralises it: phuak rao (พวกเรา) we, phuak khun (พวกคุณ) you all.
A short exchange
Read these in order as one conversation and count how many pronouns appear. Nearly all the ones English would demand are simply not there, and nothing is unclear.
Saying I in every sentence
The most common learner habit is translating word for word from English and keeping every pronoun. It is understood, but it lands the way 'I think that I would like that I have some water' would land in English: correct-ish, and exhausting. Try this drill: say a sentence with the pronoun, then say it again without. If the second one is still clear, the second one is the natural one.
Using man for a person
man (มัน) is the natural translation of 'it', so learners reach for it when talking about a person whose name they do not know. In Thai that is genuinely offensive - it puts the person in the same category as an object. Use khao (เขา) for any person at all, known or unknown, of any gender. Keep man for animals, weather, food, and things.
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