chapter  8
Special class combinations and the reflexive pronoun
Pages 5

Many mass nouns are only used in the singular and have an invariable class prefix u-(or w-before a vowel). This is the case for: ugali “stiff porridge”; uji “gruel; thin porridge”; and wali “cooked rice”. Additionally, by adding the prefix u-to a noun or an adjective, it is possible to produce a virtually unlimited number of abstract nouns, such as: mtu “human being” → utu “humanity (quality)”; mzuri → uzuri “goodness; beauty”; mwalimu → ualimu “profession/fact of being a teacher”; and mwizi “robber” → wizi “robbery”). Abstract nouns with a prefix u-are also only in the singular.