Adjectives in Predicative Position | Swahili Grammar

An adjective is predicative when it makes the main claim about a subject: Nyumba ni kubwa “The house is big.” It is attributive when it stays inside a noun phrase: nyumba kubwa “a big house.” A true Swahili adjective agrees in both jobs. Class 9 nyumba selects kubwa, while class 10 nyumba also happens to select the same surface form; another word such as hii/hizi can reveal the number.

In a neutral present affirmative clause, Standard Swahili commonly places invariable ni between subject and adjective. Present negative si replaces ni. These patterns are neutral in (informal) conversation and (formal) writing. Context can license a zero-copular reply or label, but omitting ni is not a general translation rule for English “is” and “are.”

Subject + ni + predicate adjective

The copula ni never changes for person, number, or noun class. A true adjective after it still takes the form selected by the subject.

Subject	Class	Predicate	Complete clause
mtoto	1	mdogo	Mtoto ni mdogo.
watoto	2	wadogo	Watoto ni wadogo.
gari	5	jipya	Gari ni jipya.
magari	6	mapya	Magari ni mapya.
kiti	7	kikubwa	Kiti ni kikubwa.
viti	8	vikubwa	Viti ni vikubwa.

Mtoto huyu ni mdogo, lakini anaweza kujifunga viatu.

This child is young, but can tie their own shoes.

Magari ya kampuni ni mapya na yanatumia umeme.

The company's cars are new and run on electricity.

English leaves “new” unchanged. Swahili keeps class 6 across magari—mapya—yanatumia. The copula contributes no agreement itself, so it cannot rescue a bare adjective stem.

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After ni, ask two separate questions: Is this a true agreeing adjective, and what class is the subject? The fact that ni is invariable changes neither answer.

Position changes the information, not the concord

Compare Tuliona gari jipya “We saw a new car” with Gari tuliloona ni jipya “The car we saw is new.” In the first, jipya helps identify a noun phrase. In the second, it is the new information asserted about an already identified car. Class 5 agreement remains jipya in both positions.

Nilitarajia chumba kidogo, lakini chumba tulichopewa ni kikubwa.

I expected a small room, but the room we were given is large.

Maembe yaliyo mezani ni matamu; yale ya friji bado ni mabichi.

The mangoes on the table are sweet; the ones in the fridge are still unripe.

This continuity is useful: once the controller is known, no second “predicate-adjective paradigm” must be learned. What changes is clause structure and discourse focus, not the class choice.

Invariable property words remain invariable

Words such as safi “clean,” ghali “expensive,” rahisi “easy/cheap,” salama “safe,” and muhimu “important” do not normally take the regular adjective prefixes. Their predicate forms stay unchanged.

Kliniki hii ni safi, na vyumba vyake ni salama kwa watoto.

This clinic is clean, and its rooms are safe for children.

Tiketi za asubuhi ni ghali, lakini za jioni ni rahisi.

The morning tickets are expensive, but the evening ones are cheaper.

Do not infer from vyumba ni salama that all predicate words lack agreement. Salama is lexically invariable; true -kubwa gives vyumba ni vikubwa. The adjective overview explains how Swahili distributes property meanings across several word classes.

Negative si

Present negative si replaces ni and is likewise invariable. The adjective does not switch to verbal negative morphology; it keeps the form required by the subject.

Barabara hii si pana; mabasi mawili hayawezi kupishana.

This road is not wide; two buses cannot pass each other.

Vifurushi hivi si vizito, kwa hiyo tunaweza kuvibeba wenyewe.

These parcels are not heavy, so we can carry them ourselves.

The pattern is subject + si + predicate. Class 9 barabara takes pana, its N-class outcome with -pana; class 8 vifurushi takes vizito. An invariable predicate behaves predictably too: Barabara hii si salama usiku “This road is not safe at night.”

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Use si for present negative copular description. Do not invent class forms such as visi or put verbal ha- onto an adjective.

When the copula can be zero

In a complete neutral assertion, ni makes the predication clear: Vikapu ni vikubwa. In a question-answer exchange, notice, heading, contrastive fragment, or highly contextual (informal) reply, the subject and copula may be recoverable and only the property is spoken.

Unahitaji mifuko ya ukubwa gani? Mikubwa, lakini si mizito.

What size bags do you need? Large, but not heavy.

Chumba cha mbele kikoje? Kidogo, safi, na chenye mwanga mwingi.

What is the front room like? Small, clean, and with plenty of light.

The replies mikubwa and kidogo retain class 4 and class 7 adjective concord even though the head and ni are unspoken. Safi stays invariable, and chenye has its own class 7 concord. Agreement points back to the understood noun.

A bare written sequence chumba kidogo normally reads as the noun phrase “a small room,” not automatically as the clause “the room is small.” Use chumba ni kidogo when context does not already establish a predicative reading. Headlines and proverbs may compress more aggressively, but that is a register choice, not the beginner default.

Adjective predicate versus property verb

A predicate adjective assigns a quality: Nguo ni kavu “The clothes are dry,” where kavu is the class 10 adjective form. A property verb can present a condition as reached: Nguo zimekauka “The clothes have dried/are now dry.” The second has class 10 subject marker zi- and perfect -me- in one finite verb.

Supu ni nzito kwa sababu imepoa sana.

The soup is thick because it has cooled a lot.

Sakafu imekauka, lakini bado ni chafu karibu na mlango.

The floor is dry now, but it is still dirty near the door.

The constructions can describe related realities from different viewpoints. Ni chafu directly attributes dirtiness. Imekauka treats dryness as the current result of drying. English uses “is” in both translations and can tempt learners to say ni imekauka. That is wrong because imekauka is already a finite predicate.

Past and future descriptions

Present ni/si do not carry tense. When time must be marked, finite kuwa carries subject concord: kilikuwa kidogo “it was small,” vitakuwa vikubwa “they will be big.” The adjective independently keeps its own agreement.

Duka hili lilikuwa dogo zamani, lakini litakuwa kubwa baada ya ukarabati.

This shop used to be small, but it will be large after the renovation.

This page does not give the full kuwa paradigm, but the distinction prevents a common error: ni cannot simply be combined with a past or future English meaning. Finite kuwa is a verb; ni is the invariable present copula.

Common Mistakes

Leaving a true adjective as a bare stem

❌ Vitabu hivi ni zuri kwa wanaoanza.

Incorrect — class 8 vitabu requires vizuri.

✅ Vitabu hivi ni vizuri kwa wanafunzi wanaoanza kujifunza.

These books are good for students who are beginning to learn.

Giving ni a noun-class prefix

❌ Viti vya ukumbi vini vikubwa sana.

Incorrect — ni is invariable; class 8 marking belongs on vikubwa.

✅ Viti vya ukumbi ni vikubwa na vina nafasi ya watu wawili.

The hall's chairs are large and have room for two people.

Keeping ni in a negative description

❌ Maji haya ni si baridi tena.

Incorrect — si replaces ni in a present negative copular clause.

✅ Maji haya si baridi tena baada ya kukaa juani.

This water is no longer cold after sitting in the sun.

Putting ni before a finite property predicate

❌ Matunda ni yameiva tayari.

Incorrect — yameiva is already a class 6 finite verb.

✅ Matunda yameiva tayari; tunaweza kuyauza kesho.

The fruit is ripe already; we can sell it tomorrow.

Key Takeaways

Use ni for a clear present affirmative adjective predicate and si for its present negative counterpart. Both copulas are invariable, while every true adjective continues to agree with its subject. Zero-copular replies are natural when the missing subject and copula are obvious, but a bare noun plus adjective is otherwise likely to be read as a noun phrase. Finally, distinguish an adjective after ni from a finite property verb such as imekauka: only the latter carries verbal subject concord and aspect.

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