The essential Thai Grammar concepts to understand

On the surface, Thai grammar is much simpler than European languages - there's no verb inflection and tenses can often be shown just using the words "will" or "already", single and plural nouns are by-and-large the same, no noun genders, subject and object personal pronouns are the same, and any words that aren't essential to the meaning of a sentence are usually optional and can be omitted. However, it's not all as straightforward as it might appear and the points below highlight the main differences with links to each of them in more detail where needed.

Pronunciation

Thai is a tonal language, meaning each syllable or word can potentially have a different meaning depending on what tone it is pronounced with. While Thais do a good job at understanding foreigners with less-than-perfect tonal pronunciations, there are also other pronunciation difficulties that need to be tackled.

Alphabet

Thai words and sentences are written in their own unique alphabet, and sentences are written without spaces between the words as an added challenge. Though the Thai alphabet takes some work to master, if you try to learn it you'll probably discover it's not as hard as you thought. The effort involved means it's probably not worth it if you're only planning on staying in Thailand a short time though.

Word Order

Unlike the esoteric word order of some other Asian languages like Japanese, the basic word order in Thai is simply subject + verb (+ object) as in English.

However, from there the grammar starts to diverge from English fairly quickly. One common difference is that nouns at the the start of sentences are commonly followed by their pronoun:

This can potentially cause confusion, as putting a pronoun after a noun is also the way to show possession of the noun. A related structure is to put the "topic" of the sentence first, and then use the rest of the sentence to describe it. Where the topic finishes and the sentence starts is often marked by including the relevant personal pronoun and/or with the word ก็ gôr before the next verb, but this isn't always the case.

This is particularly common where we'd say "There is/are..." instead in English:

Word Omission

Words that would be considered essential in an English sentence are frequently dropped in Thai. Both the subject and/or the object of a sentence are likely to be dropped if they can be worked out from the context, and possessive pronouns ("my", "your" etc) are usually only included in a Thai sentence if their omission would cause confusion. This has the effect of making many Thai sentences somewhat ambiguous in their meaning, and so it's commonly necessary to rely on the context to understand the intended meaning.

The pro-drop nature of Thai in addition to the "topicalization" above means that sometimes sentences that seem to be subject - verb - object in reality are object - subject - verb . For instance, the unambiguous sentence:

may in common speech be rendered more like:

To avoid confusion, at least one of the optional words in parentheses would normally be included to show where the topic ends and subject begins.

Verbs

Verbs are the cornerstone of the Thai language, and sentences with 3 or more consecutive verbs are commonplace. This is achieved by often using resultative and directional verbs where adverbs or prepositions would be used in English, using stative verbs instead of adjectives and dropping nouns and pronouns where the context makes them clear. Thai verbs don't change their form for tense, instead tenses are indicated mostly by context or with the use of words like จะ jà "will" and แล้ว láew "already".

Adjectives

Adjectives come after the noun in Thai, rather than before it as in English. The biggest difference between Thai and English adjectives though is that Thai adjectives are also verbs (for instance, the Thai adjective for "tall" is also the verb "to be tall"), and so do not need an additional "to be" verb before them.

Nouns

Nouns in Thai have the same plural form as singular, but have the difficulty that any time a noun is quantified it must be used with its classifier. Although "classifier" may be an unfamiliar term for English speakers, it's not a completely alien concept as there is an equivalent in the way English uses "measure words" for nouns that can't be directly counted ("mass nouns"). These are nouns like "paint" or "water", and to quantify them an extra measure word is needed - "two tins of paint" not "two paints" and "several buckets of water" for instance. The measure word here works in exactly the same way as a Thai classifier, but the key difference is that in Thai even directly countable nouns like "house" or "car" also need a classifier when being quantified. The classifier for a house, for instance, is หลัง lăng and so the direct translation for "many houses" in Thai is "houses - many - lăng".

Although remembering a classifier for every single noun would seem to present a fairly significant difficulty for the learner of Thai, in reality learning 20-30 classifiers is sufficient to quantify the vast majority of nouns.

Personal Pronouns, Names and Nicknames

Although pronouns are often omitted in Thai (as above), the personal pronoun system in Thai is actually very complex and varies depending on who you're talking to, what your relationship to them is and your relative ages. Family relationship terms are often used as pronouns in Thai, so it's not uncommon to address even a complete strangers as if they were a relative. In addition, Thai women frequently use their own nickname instead of a first-person pronoun, and so refer to themselves in the third person.

Questions

The question mark isn't used in Thai; it's rough equivalent is the word ไหม măi or one of the other question particles. When answering a question, Thais don't typically use "yes" and "no" as in English, but instead repeat the main verb either by itself (for an affirmative answer) or with ไม่ mâi ("no; not") before it .

Particles

Particles are short words added on to end of a clause or sentence, which usually can't be directly translated as such but function to change the feeling of a sentence. A single particle can make a sentence sound softer, more polite, more commanding, more sarcastic etc..., where as in English you'd usually have to re-phrase the sentence to get the same effect. Perhaps the most important ones to know are kráp (for men) and káะ (for women), which are the standard particles used to make a sentence sound polite. There are many more though, and correct use of particles is essential to speaking natural sounding Thai.