Agreement Across the Sentence

Swahili agreement is mandatory and happens almost everywhere. It attaches to verbs (as Subject Agreement), adjectives, possessives, and demonstratives. One notable exception is the Habitual hu- tense marker, which does not take any subject agreement prefix (e.g., mimi husoma = I usually read).

The Animacy Exception:
There is one massive exception to the rules. Most nouns that refer to a living human or animal get treated like a person, taking Class 1/2 (M-/Wa-) agreement prefixes. Even if the word for "hippo" belongs to Class 7, it will trigger Human Agreement Across Classes on verbs, adjectives, and demonstratives. However, this override is suspended for augmentatives (Class 5/6) and diminutives (Class 7/8), which strictly take the agreement of their morphological class to preserve the nuance of size or derogation (e.g., jitu = giant, kijitu = little person). Additionally, if the object of a sentence is a living human or animal, Animate Object Marking is mandatory on the verb using the Class 1/2 object infix (-m- for singular, -wa- for plural), even if the noun is explicitly stated (e.g., Nilimwona mbwa = I saw the dog). This contrasts with inanimate objects, where object marking is optional and usually used for definiteness or emphasis (e.g., Nilikiona kitabu = I saw the book).

However, this override doesn't always apply to possessives. Many kinship terms in Class 9/10 reject the override for singular possessives (e.g., mama yangu = my mother). While rafiki yangu (my friend) is the prescriptive baseline, rafiki wangu (my friend) is widely accepted in modern spoken Swahili, and the plural marafiki uses Class 2 agreement (marafiki wangu = my friends). For plural kinship terms, they take Class 10 possessives (e.g., mama zangu = my mothers, rafiki zangu = my friends). Singular animals in Class 9/10 take the human override for possessives (e.g., mbwa wangu = my dog). In the plural, possessives often take Class 10 agreement (e.g., mbwa zangu = my dogs), though Class 2 (mbwa wangu) is also used, while verbs, adjectives, numbers, and demonstratives retain the Class 2 human override (e.g., mbwa zangu wawili wamefika = my two dogs have arrived). This same rule applies to the Of and Association with -a particle: singular animals take Class 1 (e.g., mbwa wa Juma = Juma's dog), while plural animals take Class 10 (e.g., mbwa za Juma = Juma's dogs).

Don't just copy the first letters!
Beginners often try to copy the first syllable of the noun onto every other word. While this works sometimes (like kitabu kizuri = good book), it fails often because Swahili uses different paradigms of prefixes depending on the part of speech (noun, adjective, verb, or possessive) within the same noun class. For example, Class 9 nouns might start with n-, but they use i- for subject agreement, while Class 10 uses zi- for Class 9 and 10 Subject Agreement.