Class 11 contains many concrete nouns in u-, especially long, thin, extended, or narrow things: uzi “thread,” ulimi “tongue,” and ufa “crack.” It also includes concrete nouns whose meanings do not fit that tendency, such as ufunguo “key,” ukuta “wall,” and wimbo “song.” The singular controls u- subject agreement, but its plural often moves into class 10 and may look strikingly different.
The plural is the crucial difference from normally noncount class 14 u- nouns. Both classes share much of their singular concord, so initial u- alone cannot distinguish them.
This is not a class where one mechanical plural rule is enough. The reliable learning unit is singular + plural + an agreement frame. All unlabelled examples here are neutral Standard Swahili, common in speech and writing.
The singular agreement family
A class 11 singular typically uses the following central forms:
| Function | Class 11 form | Example |
|---|---|---|
| Subject marker | u- | umekatika |
| Object marker | u- | nimeuona |
| Proximal demonstrative | huu | uzi huu |
| Possessive, e.g. -angu | wangu | uzi wangu |
| Regular adjective, e.g. -refu | mrefu | uzi mrefu |
The table immediately shows why “copy u- everywhere” fails. The noun and subject marker show u-, but “this” is huu, “my” is wangu, and the regular adjective -refu appears as mrefu.
Uzi huu mrefu wangu umekatika.
This long thread of mine has snapped.
In analysis only, u-me-katik-a reveals the class 11 subject marker before the perfect marker. In ordinary spelling, the finite verb is the single word umekatika.
Plural transfer into class 10
Many class 11 singulars form a plural in class 10. Once plural, they select the class 10 agreement family: subject zi-, demonstrative hizi, possessive z-, and N-class adjective behavior.
Nyuzi hizi ndefu zangu zimekatika.
These long threads of mine have snapped.
Compare every point in the pair:
| Function | Class 11 singular | Class 10 plural |
|---|---|---|
| Noun | uzi | nyuzi |
| Adjective | mrefu | ndefu |
| Demonstrative | huu | hizi |
| Possessive | wangu | zangu |
| Subject verb | umekatika | zimekatika |
The plural is not “class 11 plus an ordinary plural suffix.” It has transferred into class 10, so the entire plural concord changes with it.
Prefix loss and nasal behavior
The class 10 plural may lose the singular u- and show a nasal-influenced beginning, or it may simply lack the singular prefix. Frequent pairings include:
| Class 11 singular | Class 10 plural | Meaning |
|---|---|---|
| uzi | nyuzi | thread(s) |
| ulimi | ndimi | tongue(s) |
| wimbo | nyimbo | song(s) |
| ubao | mbao | board(s), plank(s) |
| ufunguo | funguo | key(s) |
| ukuta | kuta | wall(s) |
These forms reflect historical sound patterns, but modern learners still have to memorize the established result. There is no safe procedure that derives every class 10 plural from the written singular. A dictionary that gives the plural is doing essential grammatical work.
The pair wimbo/nyimbo is especially instructive. The singular does not visibly begin with the full sequence u-; before a vowel-initial stem, u can surface as the glide w. Yet its agreement confirms class 11:
Wimbo huu mzuri wangu umependwa na wasikilizaji.
This beautiful song of mine has been well received by listeners.
Nyimbo hizi nzuri zangu zimependwa na wasikilizaji.
These beautiful songs of mine have been well received by listeners.
This is the required second full singular–plural chain: wimbo/nyimbo, mzuri/nzuri, huu/hizi, wangu/zangu, and umependwa/zimependwa. It also demonstrates why looking for a literal initial u is insufficient.
Long and thin is a tendency, not a definition
The semantic center helps memory: uzi is thread, ulimi is a tongue, and several other members denote extended or narrow entities. But ufunguo and wimbo show that class 11 is not simply “the long-thin class.” Historical membership and lexical convention matter.
Ufunguo huu mpya wangu umepotea tena.
This new key of mine has gone missing again.
Funguo hizi mpya zangu zimepotea tena.
These new keys of mine have gone missing again.
If a concrete noun does not have an attested class 10 plural, do not invent one by adding a nasal. Swahili also has u- nouns that pair with other plural classes and nouns that normally remain uncountable. Learn the plural of each noun, and use a number, a measure expression, or aina za... “types of...” when the intended meaning is not ordinary individual counting.
Subject and object mechanics
Class 11 u- occupies the same kind of verb slot as the subject markers of other noun classes:
Ukuta wa nyuma umeanguka baada ya mvua.
The back wall has collapsed after the rain.
When a known class 11 noun is represented as the object inside the verb, the object marker is also u-:
Ufunguo huu nimeuona mezani, lakini sijaziona funguo nyingine.
I saw this key on the table, but I have not seen the other keys.
In nimeuona, u- refers to singular ufunguo. In sijaziona, zi- refers to plural funguo. The exact discourse conditions for object marking belong elsewhere; the class contrast is what matters here.
Class 11 versus other u- nouns
Initial u- alone does not establish class 11. Class 14 abstract and mass nouns such as uzuri “beauty” and utoto “childhood” use a very similar singular concord family but normally lack an ordinary plural. A human noun or loan may also begin with u or w for unrelated reasons. Conversely, wimbo belongs to class 11 although its first letter is w.
Use meaning only as supporting evidence. The decisive bundle is the attested plural plus agreement: uzi/nyuzi; huu/hizi; ume-/zime-. This relationship between morphological form and syntactic concord is systematic, but the two are not interchangeable labels.
Common Mistakes
1. Copying u- onto every agreeing word
❌ Uzi urefu uangu umekatika.
Incorrect — class 11 uses mrefu and wangu, not forms made by copying the noun prefix u-.
✅ Uzi mrefu wangu umekatika.
My long thread has snapped.
2. Keeping class 11 agreement after forming a class 10 plural
❌ Nyuzi huu mrefu wangu umekatika.
Incorrect — nyuzi is class 10 plural and requires hizi, ndefu, zangu, and zi-.
✅ Nyuzi hizi ndefu zangu zimekatika tena.
These long threads of mine have snapped again.
3. Making the plural by replacing u- with zi-
❌ Ziufunguo hizi zimepotea.
Incorrect — zi- is a concord, not a noun prefix to paste onto ufunguo; the plural is funguo.
✅ Funguo hizi zimepotea.
These keys have gone missing.
4. Assuming every u- noun has a class 10 plural
❌ Nimeona nyuzuri nyingi mjini.
Incorrect — uzuri ‘beauty’ is an abstract class 14 noun and does not form an ordinary plural by analogy with uzi/nyuzi.
✅ Nimeona uzuri mwingi mjini.
I have seen a great deal of beauty in the city.
Key Takeaways
Concrete class 11 nouns use u- subject and object concord, huu, w- possessives, and the appropriate adjective concord. Many form class 10 plurals, but the noun changes range from prefix loss to nasal-shaped forms: ufunguo/funguo, uzi/nyuzi, and wimbo/nyimbo. Record each plural rather than guessing it. Initial u- is only a clue; the complete singular–plural pair and its agreement chain establish the analysis.
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Start learning Swahili →Related Topics
- Classes 9/10: N-Class NounsA1 — Use class 9/10 nouns whose singular and plural often look alike, with i-/zi- agreement and the nasal patterns common in this large class pair.
- Class 14: u- Abstract and Mass NounsA2 — Understand class 14 abstract and mass nouns, their u- agreement, their usual lack of a plural, and their contrast with concrete class 11.