Most of the transnational ethnic groups have their own languages in Myanmar and Thailand,and even some of them have written languages. Diversity and complication appear because of the great differences between the ethnic languages. Among them,the ethnic groups which distribute in plain such as the Mon people,Tai people and Shan people have more well-developed language system. In general,most of the languages from the hill tribes are well inherited and developed in Myanmar,while the ethnic languages in Thail...