kuweza — Can, Be Able | Swahili Grammar

Kuweza means “be able, can, manage.” It is an ordinary finite Swahili verb followed by an infinitive, not a defective auxiliary like English can. It therefore carries full tense, negation, subject agreement, and subjunctive morphology: ninaweza, niliweza, sitaweza, niweze.

All unlabelled uses below are neutral current Standard Swahili. Polite questions and promotional imperatives receive explicit register notes.

Practical paradigm

The stem is wez-. After -na-, -li-, -me-, and -ta- it keeps final -a; present negative uses final -i.

Form	I	you (sg.)	he/she	we	you (pl.)	they
present	ninaweza	unaweza	anaweza	tunaweza	mnaweza	wanaweza
past	niliweza	uliweza	aliweza	tuliweza	mliweza	waliweza
perfect	nimeweza	umeweza	ameweza	tumeweza	mmeweza	wameweza
future	nitaweza	utaweza	ataweza	tutaweza	mtaweza	wataweza
present negative	siwezi	huwezi	hawezi	hatuwezi	hamwezi	hawawezi
past negative	sikuweza	hukuweza	hakuweza	hatukuweza	hamkuweza	hawakuweza
subjunctive	niweze	uweze	aweze	tuweze	mweze	waweze

The bare imperatives are weza and wezeni. They are grammatically formed but pragmatically limited because one cannot normally command an ability into existence. They occur chiefly in (informal) promotional exhortations such as Weza zaidi “Achieve/be capable of more.” Ordinary instructions choose the desired action—Jaribu tena “Try again”—rather than command weza.

Weza zaidi kwa kujifunza ujuzi mpya kila siku.

Achieve more by learning a new skill every day.

This is slogan-like (informal) language, not the usual way to ask someone to perform a particular action.

Nimeweza kurejesha faili zote zilizofutwa kwa bahati mbaya.

I have managed to restore all the files that were deleted accidentally.

Hawakuweza kuendelea na safari kwa sababu daraja lilifungwa.

They could not continue the journey because the bridge was closed.

The build ni-me-wez-a ku-rejesh-a has a finite perfect verb followed by a class 15 infinitive. In present negative si-wez-i, both negative subject marking and final -i are required; past negative hawa-ku-wez-a instead retains final -a.

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English can has no infinitive and no ordinary past participle. Swahili kuweza is a complete verb, so conjugate it first and keep the following action in its infinitive.

Ability plus infinitive

The actor of the infinitive is normally the subject of kuweza:

Amina anaweza kuzungumza Kiswahili na Kiarabu kwa ufasaha.

Amina can speak Swahili and Arabic fluently.

Tunaweza kumaliza kazi hii kabla ya saa kumi na moja.

We can finish this work before five o'clock.

The second verb keeps ku- even though English says “can finish,” not “can to finish.” With a definite object, the object marker goes inside that infinitive:

Ninaweza kukupigia simu baada ya mkutano ukiwa huru.

I can call you after the meeting if you are free.

Here ku-ku-pig-i-a is the infinitive kupigia with second-person object marker -ku-. The two adjacent ku syllables have different jobs: the first is infinitive class 15; the second indexes “you.”

See verbs after modals for this control pattern.

Skill, opportunity, and successful completion

Present anaweza kufanya can describe learned capacity or circumstantial possibility. To emphasize learned knowledge, anajua kufanya may be more precise:

Juma anajua kuogelea, lakini hawezi kuogelea leo kwa sababu ameumia bega.

Juma knows how to swim, but he cannot swim today because he has injured his shoulder.

Past affirmative niliweza often implies that the person actually succeeded, not merely that ability existed:

Baada ya kujaribu mara tatu, niliweza kufungua mlango uliokwama.

After trying three times, I managed to open the stuck door.

Context can support a weaker past-capacity reading, but when successful completion is not intended, add information that makes the distinction clear. English could is ambiguous between general past ability, a particular successful event, possibility, and conditional politeness; Swahili selects tense and conditional morphology more explicitly.

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In a completed one-time event, niliweza kufanya commonly means “managed/succeeded in doing.” Do not assume it merely describes unused ability.

Questions as polite requests

An ability question can function as a request:

Unaweza kunisaidia kubeba sanduku hili, tafadhali?

Can you help me carry this box, please?

This is neutral and polite with appropriate tone. Adding Je, is common in careful (formal) writing and structured speech:

Je, unaweza kututumia ankara kabla ya Ijumaa?

Could you send us the invoice before Friday?

For extra deference, conditional ungeweza means “would/could you be able to”:

Ungeweza kufunga dirisha kabla hujaondoka?

Could you close the window before you leave?

This conditional form is frequent in deferential (formal) requests rather than literal questions about permanent skill. The intended social action comes from the entire interrogative construction, not from a special polite meaning inside wez-.

Negative inability, prohibition, and impossibility

Siwezi/hawezi denies ability or circumstantial possibility:

Siwezi kuhudhuria kikao leo kwa sababu mtoto wangu anaumwa.

I cannot attend the meeting today because my child is ill.

In rules, huwezi kuingia may pragmatically mean “you may not enter,” but morphologically it says entry is not possible/available. A direct prohibition uses negative subjunctive:

Usiingie kwenye maabara bila miwani ya kujikinga.

Do not enter the laboratory without protective glasses.

The lexicalized stative form inawezekana means “it is possible,” while haiwezekani means “it is impossible/not feasible”:

Inawezekana tukachelewa kidogo kwa sababu ya mvua.

It is possible that we may be a little late because of the rain.

This impersonal construction does not require a human ability-holder. It can take a finite clause or stand alone as a response.

Common collocations include kuweza kufanya “be able to do,” kuweza kumudu “be able to afford/manage,” kadiri uwezavyo “as much as you can,” and ikiwezekana “if possible.” The last two are common in neutral and (formal) instructions.

Common Mistakes

Dropping ku- after kuweza

❌ Ninaweza maliza ripoti leo.

Incorrect — the action after finite kuweza must be an infinitive.

✅ Ninaweza kumaliza ripoti leo kabla ya kikao.

I can finish the report today before the meeting.

Adding an English-style preposition

❌ Anaweza kwa kuendesha gari usiku.

Incorrect modal complement — no kwa is used before the infinitive here.

✅ Anaweza kuendesha gari usiku bila shida.

She can drive at night without difficulty.

Keeping final -a in present negative

❌ Hatuweza kufungua faili hii sasa.

Incorrect as a present negative — hatuweza is past-relative-looking/nonstandard for this intended form.

✅ Hatuwezi kufungua faili hii bila nenosiri.

We cannot open this file without the password.

Confusing inability with a prohibition

❌ Huwezi kuvuta sigara hapa!

Ambiguous for a direct command — this literally presents smoking here as unavailable or impossible.

✅ Usivute sigara hapa; ni marufuku.

Do not smoke here; it is prohibited.

Key Takeaways

Kuweza is fully conjugated: ninaweza, niliweza, nimeweza, nitaweza, siwezi, sikuweza.
The following action is an infinitive with ku-; its understood actor is normally the subject of kuweza.
Past affirmative often conveys actual success: “managed to.”
Ability questions make polite requests, with ungeweza adding deference.
Negative kuweza expresses inability or impossibility; negative subjunctive gives a direct prohibition.

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