Classes 9/10: N-Class Nouns

Classes 9 and 10 contain some of the most frequent nouns in Standard Swahili: nyumba “house,” nguo “garment/clothes,” barua “letter,” simu “telephone,” and ndege “bird or airplane.” The class pair is often called the N-class because many members have a historical nasal prefix. Its most important practical feature is that the singular and plural noun frequently have exactly the same visible form.

This contrasts with the visibly paired ki-/vi- nouns introduced on the classes 7/8 page. Here, agreement rather than noun shape may carry the entire singular–plural distinction.

English speakers expect number to appear on the noun itself: house/houses. Swahili can instead place the decisive contrast in agreement. Class 9 singular uses i- on a subject verb, while class 10 plural uses zi-. All unlabelled examples below are neutral Standard Swahili in both ordinary conversation and writing.

One noun form, two agreement patterns

Follow nyumba through a full singular and plural frame:

The noun nyumba does not change. The regular adjective kubwa also happens to have the same surface form here. Number becomes clear in three other places: hii/hizi “this/these,” yangu/zangu “my,” and verbal i-/zi- in imeuzwa/zimeuzwa.

There is no plural suffix to add. Context, a number, or agreement tells the listener how many houses are intended.

A second pair: nguo

The pair nguo/nguo shows the same agreement contrast with another adjective:

Here mpya “new” also looks identical in classes 9 and 10. That is a deceptive surface pattern: noun plus adjective can remain unchanged while demonstrative, possessive, and verb reveal singular versus plural. Saying only nguo mpya can therefore mean “a new garment” or “new garments” until context resolves it.

That ambiguity is harmless in a bare phrase or in an object phrase with no overt number cue. Wherever the syntax supplies an agreeing demonstrative, possessive, or finite subject verb, its required form normally resolves the number; Swahili does not add extra morphology to the noun itself.

What “N-class” means on the noun

The historical nasal component interacts with the first sound of the stem. As a result, frequent nouns begin with several different-looking nasal sequences:

The apostrophe in ng'ombe is part of standard spelling because ng' represents a different consonant from the sequence written ng. Do not add apostrophes to ordinary nguo or ngoma.

Not every class 9/10 noun begins with a nasal. Many members have no visible N-prefix at all, especially loans: barua/barua “letter(s),” simu/simu “telephone(s),” meza/meza “table(s),” and hoteli/hoteli “hotel(s).” Their agreement, not their first letter, identifies the class.

This is why neither “starts with n” nor “has no prefix” is an adequate class rule. A nasal-initial noun may belong elsewhere, and a vowel- or consonant-initial loan may belong to 9/10.

Subject and object slots

When an N-class noun is the subject, i- or zi- occupies the subject slot before tense and aspect. In analysis, i-me-fik-a and zi-me-fik-a show the pieces; normal spelling is imefika and zimefika.

When a known inanimate N-class noun is represented inside the verb as an object, the corresponding object markers are also i- and zi-:

In nimeiona, object i- refers to one class 9 house. In sijaziona, zi- refers to multiple class 10 houses. These are slots inside one finite verb, never separate words. The wider conditions governing object marking belong on its dedicated page.

Morphological class and animate agreement

Class 9/10 is a major home for animal nouns, but animate reference exposes the difference between noun morphology and syntactic agreement. Ng'ombe has the same N-class noun form in singular and plural. When speakers refer to cattle as living individuals, human/animate class 1/2 agreement is standard and common:

The noun remains morphologically 9/10, while huyu/hawa, mkubwa/wakubwa, and amechoka/wamechoka follow animate agreement. Detailed variation with animals belongs on the dedicated animate-agreement page; the key principle is that the noun’s visible prefix and its sentence-level concord need not be identical.

Human loans make the same warning even clearer. A profession word should not be assigned inanimate i-/zi- agreement merely because it lacks an m-/wa- noun prefix. Human meaning selects human concord in ordinary reference.

The established plural is madaktari, and the people take plural human agreement. Conversely, a nonhuman loan such as simu normally uses class 9/10: simu hii imeharibika / simu hizi zimeharibika. Borrowed nouns must therefore be learned with both their plural behavior and a concord frame.

When neighboring constructions are clearer

If an unchanged noun is ambiguous and number matters, add an agreeing demonstrative, numeral, or verb rather than inventing a noun ending. Nyumba hizi mbili zimeuzwa unambiguously means “these two houses have been sold.” When a new loan is unfamiliar, avoid guessing its class from English countability; check established Swahili use. Some loans enter 9/10, others take ma- plurals, and human referents select human agreement.

Common Mistakes

1. Adding an English-style plural ending

2. Leaving singular verbal agreement with a plural subject

3. Using the noun's nasal as a subject marker

4. Giving an animal inanimate agreement solely from noun shape

Key Takeaways

Classes 9 and 10 frequently share one noun form, so agreement carries the number contrast: class 9 i-, hii, yangu versus class 10 zi-, hizi, zangu. Nasal beginnings are common but take several surface shapes, and many loans have no visible nasal at all. Regular adjectives may also look identical across the pair. Confirm the analysis from the full concord chain, and expect animate meaning to affect syntactic agreement even when an animal noun retains N-class morphology.