Human Agreement Across Classes

Swahili groups nouns into classes, and usually, the noun's class dictates the agreement markers for the whole sentence. However, the animacy override prioritizes the meaning of the word over its shape.

When a noun refers to an animate being (human, animal, or supernatural beings like Mungu, malaika, or shetani), it triggers Class 1 (singular) or Class 2 (plural) agreement on:

• Verbs: Subject prefixes (a-/wa-) and object infixes (-m-/-wa-). Note that for animate objects, the object infix is generally mandatory, though sometimes omitted for non-specific/indefinite objects in casual speech, whereas inanimate objects only take the infix for emphasis or high focus.
• Adjectives: Taking m-/wa- prefixes
• Demonstratives: Using huyu/hawa, yule/wale, etc.
• Possessives: Taking Class 1/2 prefixes (e.g., wangu, wako, wake, wetu, wenu, wao), such as kipofu wangu (my blind person). Note that the singular and plural forms for Class 1 and 2 possessives are identical (both use w-). This can create ambiguity for nouns that do not change their shape in the plural (like Class 9/10 nouns, where mbwa wangu could mean 'my dog' or 'my dogs').
• Associative particle: Using wa for both singular and plural (with some exceptions)
• Numbers and Quantifiers: Taking Class 1 (m-/mw-) or Class 2 (wa-) prefixes (e.g., mmoja, wawili, wote, wengi)

Crucial Rule: The noun itself does not change its native prefix to match Class 1/2. For example, kipofu (blind person) is in Class 7 (KI-), but it takes Class 1 agreement: Kipofu huyu anaona (This blind person sees). You do not change the noun to *mkipofu. In the plural, the noun changes according to its native class (vipofu in Class 8), but it takes Class 2 agreement: Vipofu hawa wanaona (These blind people see). Note that plants and trees are grammatically inanimate and do not trigger this override.

The Kinship Exception:
There is one major exception. Pronominal possessives (my, your, his/her) for many Class 9/10 kinship terms and close relations (like baba, mama, rafiki, ndugu) resist this override. They take Class 9/10 agreement (e.g., singular rafiki yangu, plural rafiki zangu). This exception often extends to the associative particle -a for many speakers (e.g., mama ya Juma or mama za Juma). Because Class 1 and 2 possessives are identical, using the Class 10 z- prefix is widely used to explicitly mark plurality. Even when the noun rafiki takes the plural form marafiki, it retains the Class 10 kinship exception for possessives (marafiki zangu). Adjectives for these same words STILL take the animacy override (e.g., rafiki yangu mzuri). Even with these possessive exceptions, the verb still takes Class 1/2 agreement (Rafiki yangu mzuri anasoma).

Animals:
Animals generally follow this rule and take Class 1/2 agreement for verbs, adjectives, and demonstratives. However, for possessives, because the Class 1 and 2 forms are identical (e.g., wangu), Class 9/10 animals frequently take Class 10 possessive agreement in the plural (e.g., mbwa zangu) to explicitly mark plurality. Additionally, when referring to dead animals or meat, the animacy override is dropped and they revert to their native inanimate class agreement (e.g., kuku huyu for a live chicken vs. kuku hii for chicken meat). Note that using inanimate agreement on verbs changes the meaning entirely: ndege wanaruka means 'the birds are flying' (animate), while ndege zinaruka means 'the airplanes are flying' (inanimate).