Tone sandhi
Encyclopedia
Tone sandhi is a feature of tonal languages
Tone (linguistics)
Tone is the use of pitch in language to distinguish lexical or grammatical meaning—that is, to distinguish or inflect words. All verbal languages use pitch to express emotional and other paralinguistic information, and to convey emphasis, contrast, and other such features in what is called...

 in which the tones assigned to individual words vary based on the pronunciation of the words that surround them in a phrase or sentence. It is a type of sandhi
Sandhi
Sandhi is a cover term for a wide variety of phonological processes that occur at morpheme or word boundaries . Examples include the fusion of sounds across word boundaries and the alteration of sounds due to neighboring sounds or due to the grammatical function of adjacent words...

, or fusional change, from the Sanskrit
Sanskrit
Sanskrit , is a historical Indo-Aryan language and the primary liturgical language of Hinduism, Jainism and Buddhism.Buddhism: besides Pali, see Buddhist Hybrid Sanskrit Today, it is listed as one of the 22 scheduled languages of India and is an official language of the state of Uttarakhand...

 word for "joining".

Languages with tone sandhi

Not all tone languages have tone sandhi. Sandhi rules are found in many of the Oto-Manguean languages
Oto-Manguean languages
Oto-Manguean languages are a large family comprising several families of Native American languages. All of the Oto-Manguean languages that are now spoken are indigenous to Mexico, but the Manguean branch of the family, which is now extinct, was spoken as far south as Nicaragua and Costa Rica.The...

 of Mexico. Cherokee
Cherokee language
Cherokee is an Iroquoian language spoken by the Cherokee people which uses a unique syllabary writing system. It is the only Southern Iroquoian language that remains spoken. Cherokee is a polysynthetic language.-North American etymology:...

 has a robust tonal system in which tones may combine in various ways, following subtle and complex tonal rules that vary from community to community.

Many Chinese languages have tone sandhi, some of it quite complex. While Mandarin sandhi is simple, Amoy Min has a more 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 syllables, which end in a stop consonant
Stop consonant
In phonetics, a plosive, also known as an occlusive or an oral stop, is a stop consonant in which the vocal tract is blocked so that all airflow ceases. The occlusion may be done with the tongue , lips , and &...

. (These are numbered 4 and 8 in the diagram above.) Within a phonological word
Phonological word
The phonological word or prosodic word is a constituent in the phonological hierarchy higher than the syllable and the foot but lower than intonational phrase and the phonological phrase...

, all syllables but the last one change tone. Among unstopped syllables (that is, those that do not end in a stop), tone 1 becomes 7, tone 7 becomes 3, tone 3 becomes 2, and tone 2 becomes 1. Tone 5 becomes 7 or 3, depending on dialect. Stopped syllables ending in /p/, /t/, or /k/ take the opposite tone (phonetically, a high tone becomes low, and a low tone becomes high), whereas syllables ending in a glottal stop
Glottal stop
The glottal stop, or more fully, the voiceless glottal plosive, is a type of consonantal sound used in many spoken languages. In English, the feature is represented, for example, by the hyphen in uh-oh! and by the apostrophe or [[ʻokina]] in Hawaii among those using a preservative pronunciation of...

 (written h in the diagram above) drop their final consonant to become tones 2 or 3.

The seven or eight tones of Hmong
Hmong language
Hmong or Mong is the common name for a dialect continuum of the West Hmongic branch of the Hmong–Mien/Miao–Yao language family spoken by the Hmong people of Sichuan, Yunnan, Guizhou, Guangxi, northern Vietnam, Thailand, and Laos...

 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).

What is and is not tone sandhi

Tone sandhi is compulsory as long as the environmental conditions that trigger it are met. It is not to be confused with tone changes
Changed tone
Cantonese changed tones occur when a word's tone becomes a different tone due to a particular context or meaning. The changed tone is the tone of the word when read in a particular lexical or grammatical context, while the base tone is usually the tone of the word when read in citation...

 that are due to derivation
Derivation (linguistics)
In linguistics, derivation is the process of forming a new word on the basis of an existing word, e.g. happi-ness and un-happy from happy, or determination from determine...

al or inflectional morphology. For example, in Cantonese, the word "sugar" is pronounced tòng (/tʰɔːŋ˨˩/ or /tʰɔːŋ˩˩/, with low (falling) tone), whereas the derived word "candy" (also written 糖) is pronounced tóng (/tʰɔːŋ˧˥/, with mid rising tone). Such a change is not triggered by the phonological environment of the tone, and therefore is not an example of sandhi. Changes of morphemes in Mandarin to the neutral tone are also not examples of tone sandhi.

In Hokkien (Taiwanese), the words kiaⁿ  (high tone, meaning "afraid") and lâng (curving upward tone, meaning "person") combine to form two different compound words with different tones. When combined via sandhi rules, kiaⁿ  is spoken in basic tone and lâng in original tone (written in POJ as kiaⁿ-lâng). This means "frightfully dirty" or "filthy". This follows the basic tone sandhi rules. However, when kiaⁿ  is spoken in original high tone, and lâng rendered in low tone (written kiaⁿ--lâng), it means "frightful". This derivational process is distinct from the semantically empty change of tone that automatically occurs when kiaⁿ  is followed by lâng, and so is not tone sandhi.

Mandarin Chinese

Mandarin
Standard Chinese
Standard Chinese, or Modern Standard Chinese, also known as Mandarin or Putonghua, is the official language of the People's Republic of China and Republic of China , and is one of the four official languages of Singapore....

 features three sandhi tone rules.

1. When there are two 3rd tones in a row, the first one becomes 2nd tone. E.g. 你好 (nǐ + hǎo = ní hǎo)

2. 不 (bù) is 4th tone except when followed by another 4th tone, when it becomes second tone. E.g. 不对 (bù + duì = bú duì)

3. 一 (Yī) is 1st tone when alone, 2nd tone when followed by a 4th tone, and 4th tone when followed by any other tone. Examples: 一个 (yī + gè = yí gè), 一次 (yī + cì = yí cì), 一半 (yī + bàn = yí bàn), 一般 (yī + bān = yì bān), 一毛 (yī + máo = yì máo), 一会儿 (yī + huǐr = yì huǐr).

See also

  • Downdrift
    Downdrift
    In phonetics, downdrift is the cumulative lowering of pitch over time due to interactions among tones, called downstep, in a tonal language. It is distinct from the general lowering of the pitch during prosodic contours of a tonal or non-tonal language....

  • Downstep
    Downstep (phonetics)
    In phonetics, downstep is a phonemic or phonetic downward shift of tone between the syllables or words of a tonal language. It is best known in the tonal languages of West Africa, but the pitch accent of Japanese is quite similar to downstep in Africa. Downstep contrasts with the much rarer upstep...

  • Floating tone
    Floating tone
    A floating tone is a morpheme or element of a morpheme that contains no consonants, no vowels, but only tone. It cannot be pronounced by itself, but affects the tones of neighboring morphemes....

  • Tone terracing
    Tone terracing
    Tone terracing is a type of phonetic downdrift, where the high or mid tones, but not the low tone, shift downward in pitch after certain other tones...

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