Either of two surface tone distinctions, H (high) or L (low), is possible for each syllable (and in certain limited cases rising (LH) and falling (HL) tones are possible too). There is a subtype within the L tone category: when a syllable is 'depressed' (that is, from a depressor consonant in the onset position, or a morphologically or lexically imposed depression feature in the syllabic nucleus), the syllable is produced phonetically at a lower pitch. This system of tone depression is phonologically regular (that is, the product of a small number of phonological parameters), but is highly complex, interacting extensively with the morphology (and to some extent with the lexicon). Phonologically, Phuthi is argued to display a three-way High/Low/toneless distinction. Like all Nguni languages, Phuthi also displays phonetically rising and falling syllables, always related to the position of a depressed syllabic nucleus.