Tumbuka tonology

Like most other Niger–Congo languages, the Tumbuka language is a tonal language with two basic surface tones: high (H) and low (L). Tumbuka grammatical tone is moderately complex and displays several productive sandhi processes, including tone spreading, tone lowering, and the docking of “floating” tones from certain morphemes.

Although Tumbuka tone is less complex than that of some neighbouring languages (for example, Ngoni and certain Bemba dialects), it exhibits a characteristic split between lexical tone (in roots and nouns) and grammatical tone (introduced by verbal morphology, relative markers, and focus constructions). Unlike many Nguni languages, Tumbuka lacks depressor consonants and therefore has no depressor-induced tone raising or delayed high tone: tonal operations occur primarily on the basis of the underlying tone class of morphemes.

The tone of a Tumbuka syllable is borne by the vowel and, in rare cases, the syllabic nasal [n̩] when it occurs word-initially before voiceless consonants.

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