http://www.mrchevy.com/LearningThai.htmIntroduction
Thai language is a unique language and quit a bit hard to learn because you will find the differences of the intonations and accent. It depends on people who live in these areas :
Northern, speak slowly and sounds more polite than southern and north east with the word "Jaw" ending.
Southern, speak fast and reduce words in the sentences when communicate with people from the south, for example "Where are you going? = Khun pai nai" reduces to "Nai?" "I'm going home. = Chan pai ban" reduces to "Ban".
North East, there a bit difference in some words, and an accent, also mixed with Laos.
Middle and Bangkok, speak regular speech, and also use formal language.
The formal language are used in spoken and written in school, organization, business and government. In the other hand when you speak with special kind of people such as the royal family or monks, then the differences words will be using. We write and read a words in a sentence from left to right, and usually no space or intervals between them. In the modern Thai, there are 44 consonants. Of these, 16 are redundant, leaving in all 28 basic consonantal sounds. The redundant consonants are used chiefly in transliteration of Sanskrit and Pali words. In fact, there are two consonants in this redundancy which have become obsolete.