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Standard Chinese phonology, Historical Chinese phonology, and Varieties of Chinese § Phonology
Spoken Mandarin Chinese
The phonological structure of each syllable consists of a nucleus that has a vowel (which can be a monophthong, diphthong, or even a triphthong in certain varieties), preceded by an onset (a single consonant, or consonant+glide; zero onset is also possible), and followed (optionally) by a coda consonant; a syllable also carries a tone. There are some instances where a vowel is not used as a nucleus. An example of this is in Cantonese, where the nasal sonorant consonants /m/ and /ŋ/ can stand alone as their own syllable.
In Mandarin much more than in other spoken varieties, most syllables tend to be open syllables, meaning they have no coda (assuming that a final glide is not analyzed as a coda), but syllables that do have codas are restricted to nasals /m/, /n/, /ŋ/, the retroflex approximant /ɻ /, and voiceless stops /p/, /t/, /k/, or /ʔ/. Some varieties allow most of these codas, whereas others, such as Standard Chinese, are limited to only /n/, /ŋ/ and /ɻ /.
The number of sounds in the different spoken dialects varies, but in general there has been a tendency to a reduction in sounds from Middle Chinese. The Mandarin dialects in particular have experienced a dramatic decrease in sounds and so have far more multisyllabic words than most other spoken varieties. The total number of syllables in some varieties is therefore only about a thousand, including tonal variation, which is only about an eighth as many as English