Thai language has been threatened by foreign languages. For hundreds of years, Thailand has demonstrated its uniqueness in Thai language, as an ‘ethnic marker’. (Kong 1999, p.226) Yet, affected by English language, the use of Thai language, especially grammar and pronunciation, has been distorted. Overmore Thai practice English on a regular basis and replace Thai with English words and structures, both written and spoken. Even worse, some pronounce Thai characters in a word in English style, such as /ch/ and /sh/ sounds. Hence, a Thai language crisis occurs as people neglect proper conventional Thai usage and do not realize that their language is, as Tomlinson (2002, p. 269) cited, ‘nations’ treasure which is fragile, can be lost, and needs protecting and preserving’.