Vietnamese , formerly known under the French colonization as Annamese (see Annam), is the national and official language of Vietnam. It is the mother tongue of the Vietnamese people , who constitute 86% of Vietnam's population, and of about three million overseas Vietnamese, most of whom live in the United States. It is also spoken as a second language by some ethnic minorities of Vietnam. It is part of the Austroasiatic language family, of which it has the most speakers by a significant margin (several times larger than the other Austroasiatic languages put together). Much vocabulary has been borrowed from Chinese, and it was originally written using the Chinese writing system. The Vietnamese writing system in use today is an adapted version of the Latin alphabet, with additional diacritics for tones and certain letters. Vietnamese was identified more than 150 years ago to be part of the Viet-Muong (or Vietic) grouping of the Mon-Khmer branch of the Austroasiatic language family, a family that also includes Khmer, spoken in Cambodia, as well as various tribal and regional languages, such as the Munda languages, spoken in eastern India, and others in southern China. Even though this is supported by etymological comparison , some linguists still believe that Viet-Muong is a separate family, genealogically unrelated to other Mon-Khmer languages. The ancestor of the Vietnamese language was originally based in the area of the Red River in what is now northern Vietnam, and during the subsequent expansion of the Vietnamese language and people into what is now central and southern Vietnam , Vietnamese was linguistically influenced primarily by Chinese, which came to predominate politically in the 2nd century B.C.E. With the rise of Chinese political dominance came radical importation of Chinese vocabulary and grammatical influence. As Chinese was, for a prolonged period, the only medium of literature and government, as well as the primary written language of the ruling class in Vietnam, much of the Vietnamese lexicon in all realms consists of Hán Vi?t (Sino-Vietnamese) words. In fact, as the vernacular language of Vietnam gradually grew in prestige toward the beginning of the second millennium, the Vietnamese language was written using Chinese characters adapted to write Vietnamese, in a similar pattern as used in Japan (kanji), Korea (hanja), and other countries in the Sinosphere. As contact with the West grew, the system of Romanized writing was developed in the 17th century by Portuguese and other Europeans involved in proselytizing and trade in Vietnam. When France invaded Vietnam in the late 19th century, French gradually replaced Chinese as the official language in education and government. Vietnamese adopted many French terms. In addition, many Sino-Vietnamese terms were devised for Western ideas imported through the French. However, the Romanized script did not come to predominate until the beginning of the 20th century, when education became widespread and a simpler writing system was found more expedient for teaching and communication with the general population.

Indonesian (Bahasa Indonesia) is the official language of Indonesia. Indonesian is a standardized dialect of the Malay language that was officially defined with the declaration of Indonesia's independence in 1945 although in the 1928 Indonesian Youth Pledge have declared it as the official language. Indonesia is the fourth most populous nation in the world. Of its large population the number of people who fluently speak Indonesian is fast approaching 100%, thus making Indonesian one of the most widely spoken languages in the world.Most Indonesians, aside from speaking the national language, are often fluent in another regional language or local dialect (examples include Minangkabau, Sundanese and Javanese) which are commonly used at home and within the local community. Most formal education, as well as nearly all national media and other forms of communication, are conducted in Indonesian. In East Timor, which was an Indonesian province from 1975 to 1999, the Indonesian language is recognised by the constitution as one of the two working languages (the other is English, alongside the official languages of Tetum and Portuguese). The Indonesian name for the language is Bahasa Indonesia (lit. "the language of Indonesia"). In the same way that English speakers would refer to the official language of France as "French" (not Français), the most accurate way of referring to Indonesia's national language in English is "Indonesian". However, the foreign term Bahasa Indonesia can sometimes still be found in written or spoken English. In addition, the language is sometimes referred to as "Bahasa" by English-speakers, though this simply means "language" and thus is also not an official term for the Indonesian language. Linguistics To a certain degree, Indonesian can be regarded as an open language. Over the years, foreign languages such as Sanskrit, Chinese, Arabic, Portuguese, Dutch and English have enriched and expanded the Indonesian language, mostly through trade contacts and international media. Because of its semi-open status, there are those who regard Indonesian (as well as other forms of Malay) as lacking sufficient vocabularly and specialist terminologies. Yet some linguists consider this view to be a misconception, as a vast majority of foreign adopted words do have native equivalents. For example, the word asimilasi (from the Dutch word assimilatie) can also be expressed in Indonesian as penggabungan. Many words describing more modern inventions, objects or ideas are often Indonesianised adoptions of foreign words (e.g. computer becomes komputer), although many of these words also have Indonesian equivalents. For example, a "cell/mobile phone" can be referred to in Indonesian as either pon-sel/ telepon seluler (lit. cellular-telephone), HP (pronounced hah-péh - the acronymic form of hand phone) or telepon genggam (lit. "hold-in-the-hand telephone"). Other words such as "rice cooker" may be referred to simply as "rice cooker" or, again, in a more native Indonesian/ Malay form, i.e. penanak nasi (a word formed from the verb menanak, meaning 'to cook rice by boiling' + nasi, meaning 'cooked rice'). Overall, the use of native and non-native words in Indonesian is equally common and reflects the country's efforts towards modernization and globalization. Many aspects of Indonesian grammar are relatively simple in the initial stages of study, making it one of the easiest languages to learn for adults. Indonesian does not require conjugation of verb tenses or participles, plural forms, articles and gender distinction for the third person pronouns. It is important to note that neither do many other languages traditionally regarded as 'complex', including Chinese (see Chinese grammar) and Thai for example. In spite of this, Indonesian and Malay are generally regarded as easy languages to learn, mostly because they are not tonal languages and they no longer use complex characters within their writing system, but rather utilize the Latin alphabet. Similar cases can also be seen in other Southeast Asian languages such as Vietnamese and Tagalog. However, Indonesian does possess a complex system of affixations. The absence of tenses in the language is substituted through the use of aspect particles and (as with any language) Indonesian grammar often presents an array of exceptions. Also, the simplicity of Indonesian grammar at a beginners or basic level has the disadvantage of misleading many learners of the language into thinking that more advanced Indonesian grammar is just as simple.

The Thai alphabet uses forty-four consonants and fifteen basic vowel characters. These are horizontally placed, left to right, with no intervening space, to form syllables, words, and sentences. Vowels are written above, below, before, or after the consonant they modify, although the consonant always sounds first when the syllable is spoken. The vowel characters (and a few consonants) can be combined in various ways to produce numerous compound vowels (diphthongs and triphthongs). Unlike the Chinese language, Thai is alphabetic, so pronunciation of a word is independent of its meaning . On the other hand, Thai is tonal, like Chinese and unlike English. This means that each word has a certain pitch characteristic with which it must be spoken to be properly understood. The Thai language uses five tones: mid, low, high, rising, and falling. Each syllable, consisting of one or more consonants and a simple or compound vowel has a default tone determined by several factors, including the type of consonant(s) present (consonants are divided into three classes for this purpose). The syllable's tone can be modified by one of four tone marks. The final tone of a syllable is determined by the tone mark in conjunction with the type of syllable, as determined by the vowel and consonant characters present.

Thai is the national and official language of Thailand and the mother tongue of the Thai people, Thailand's dominant ethnic group. Thai is a member of the Tai group of the Tai-Kadai language family. The Tai-Kadai languages are thought to have originated in what is now southern China, and some linguists have proposed links to the Austroasiatic, Austronesian, or Sino-Tibetan language families. It is a tonal and analytic language. The combination of tonality, a complex orthography, relational markers and a distinctive phonology can make Thai difficult to learn for those who do not already speak a related language. Standard Thai, also known as Central Thai or Siamese, is the official language of Thailand, spoken by about 65 million people including speakers of Bangkok Thai . Khorat Thai is spoken by about 400,000 (1984) in Nakhon Ratchasima; it occupies a linguistic position somewhere between Central Thai and Isan on a dialect continuum, and may be considered a variant or dialect of either. In addition to Standard Thai, Thailand is home to other related Tai languages, including: * Isan (Northeastern Thai), the language of the Isan region of Thailand, considered by some to be a dialect of the Lao language, which it very closely resembles (although it is written in the Thai alphabet). It is spoken by about 15 million people (1983). * Nyaw language, spoken mostly in Nakhon Phanom Province, Sakhon Nakhon Province, Udon Thani Province of Northeast Thailand. * Galung language, spoken in Nakhon Phanom Province of Northeast Thailand. * Lü (Tai Lue, Dai), spoken by about 78,000 (1993) in northern Thailand. * Northern Thai (Lanna, Kam Meuang, or Thai Yuan), spoken by about 6 million (1983) in the formerly independent kingdom of Lanna (Chiang Mai). * Phuan, spoken by an unknown number of people in central Thailand and Isan. * Phu Thai, spoken by about 156,000 around Nakhon Phanom Province (1993). * Shan (Thai Luang, Tai Long, Thai Yai), spoken by about 56,000 in north-west Thailand along the border with the Shan States of Burma (1993). * Song, spoken by about 20,000 to 30,000 in central and northern Thailand (1982). * Southern Thai (Pak Dtai), spoken about 5 million (1990). * Thai Dam, spoken by about 20,000 (1991) in Isan and Saraburi Province. Many of these languages are spoken by larger numbers outside of Thailand. Most speakers of dialects and minority languages speak Central Thai as well, since it is the language used in schools and universities all across the kingdom. Numerous languages not related to Thai are spoken within Thailand by ethnic minority hill tribespeople. These languages include Hmong-Mien (Yao), Karen, Lisu, and others. Standard Thai is composed of several distinct registers, forms for different social contexts: * Street Thai : informal, without polite terms of address, as used between close relatives and friends. * Elegant Thai : official and written version, includes respectful terms of address; used in simplified form in newspapers. * Rhetorical Thai: used for public speaking. * Religious Thai: (heavily influenced by Sanskrit and P?li) used when discussing Buddhism or addressing monks. * Royal Thai : (influenced by Khmer) used when addressing members of the royal family or describing their activities. Many Thais can speak at only the first and second levels, though they will understand the others.