Thai is a tonal language and the script gives full information on the tones. This language is considered to be the first script in the world which invented tone marks to indicate distinctive tones. They are realized in the vowels, but indicated in the script by a combination of the class of the initial consonant, vowel length and closing consonant or one of four marks.
Thai consonants are written horizontally from left to right with vowels arranged above, below, to the left, or to the right of the corresponding consonant, or in a combination of positions. The consonants may change their sound at the end of a syllable. Thai script i a writing system in which each consonant may invoke an inherent vowel sound.In the case of the Thai script this is an implied "a" or "o"
Thai has no spaces between words, no punctuation, no question marks and no exclamation marks. Nowadays, minor pauses in sentences may be marked by a comma and major pauses by a period or, more often, by a blank space.