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Tone sandhi is a phonological change occurring in tonal languages, in which the tones assigned to individual words or morphemes change based on the pronunciation of adjacent words or morphemes.〔 〕 It usually simplifies a bidirectional tone into a one-direction tone.〔 〕 It is a type of sandhi, or fusional change, from the Sanskrit word for "joining". ==Languages with tone sandhi== Tone sandhi occurs to some extent in nearly all tonal languages, manifesting itself in different ways.〔 〕 Tonal languages, characterized by their use of pitch to affect meaning, appear all over the world, especially in the Niger-Congo language family of Africa, and the Sino-Tibetan language family of East Asia,〔 as well as other East Asian languages such as Tai-Kadai, Vietnamese, and Papuan languages. Tonal languages are also found in many Oto-Manguean and other languages of Central America,〔 as well as in parts of North America (such as Athapaskan in British Columbia, Canada),〔 〕 and Europe.〔 Many North American and African tonal languages undergo "syntagmatic displacement," as one tone is replaced by another in the event that the new tone is present elsewhere in the adjacent tones. Usually, these processes of assimilation occur from left to right. In the Bantu languages of West Africa, for example, an unaccented syllable takes the tone from the closest tone to its left.〔 However, in East and Southeast Asia, "paradigmatic replacement" is a more common form of tone sandhi, as one tone changes to another in a certain environment, whether or not the new tone is already present in the surrounding words or morphemes.〔 Many languages spoken in China have tone sandhi, some of it quite complex.〔 Amoy Min has a complex system, with every one of its tones changing into a different tone when it occurs before another, and which tone it turns into depends on the final consonant of the syllable that bears it. Amoy has five tones, which are reduced to two in checked syllables (which end in a stop consonant—these are numbered 4 and 8 in the diagram above). Within a phonological word, all syllables but the last change tone. Among unchecked syllables (that is, those that do not end in a stop), tone 1 becomes 7, 7 becomes 3, 3 becomes 2, and 2 becomes 1. Tone 5 becomes 7 or 3, depending on dialect. Stopped syllables ending in , , or take the opposite tone (phonetically, a high tone becomes low, and a low tone becomes high), whereas syllables ending in a glottal stop (written ''h'' in the diagram above) drop their final consonant to become tone 2 or 3. The seven or eight tones of Hmong demonstrate several instances of tone sandhi. In fact the contested distinction between the seventh and eighth tones surrounds the very issue of tone sandhi (between glottal stop (-m) and low rising (-d) tones). High and high-falling tones (marked by -b and -j in the RPA orthography, respectively) trigger sandhi in subsequent words bearing particular tones. A frequent example can be found in the combination for numbering objects (ordinal number + classifier + noun): ib (one) + tus (classifier) + dev (dog) > ib tug dev (note tone change on the classifier from -s to -g). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「tone sandhi」の詳細全文を読む スポンサード リンク
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