Tonal Rules
Sesotho is a grammatical tone language; this means that words may be pronounced with varying tonal patterns depending on their particular function in a sentence. Another interpretation is that the tones of the language interact in their own intricate "tonal grammar."
In order to create certain grammatical constructs, certain tonal rules may be used to modify the underlying tones of the word to create their surface tones. The words are then spoken using the surface tones.
This system is naturally somewhat complex. Indeed, the development of autosegmental phonology was largely motivated by the need for a satisfactory theoretical framework to deal with the tonal grammars of Niger–Congo languages. This article attempts to explain certain aspects of Sesotho tonology in a rule-based autosegmental framework.
The rules presented below are almost exclusively used in constructing the verbal complex as this is the part of speech most radically affected by the tonal grammar.
Read more about this topic: Sotho Tonology
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