The sequence bila + ku-infinitive means “without doing”: Aliondoka bila kusema kwa heri “She left without saying goodbye.” Bila supplies the negative relation, while the infinitive names the action that did not accompany the main event. The infinitive does not take ordinary subject or TAM marking.
By default, listeners usually understand the main-clause subject as the performer of the unrealized action. A different performer can be named before the infinitive: Aliondoka bila sisi kujua “She left without us knowing.” These neutral Standard Swahili patterns occur in both (informal) conversation and (formal) prose.
Six complete structures
| Expression | Analytic build | Interpretation |
|---|---|---|
| aliondoka bila kusema | a-li-ondok-a + bila + ku-sem-a | she left without speaking |
| alisaini bila kusoma | a-li-saini + bila + ku-som-a | she signed without reading |
| tulipita bila kumwona | tu-li-pit-a + bila + ku-mw-on-a | we passed without seeing her |
| ataingia bila kutumia | a-ta-ingi-a + bila + ku-tumi-a | she will enter without using |
| hakuondoka bila kulipa | ha-ku-ondok-a + bila + ku-lip-a | she did not leave without paying |
| walimaliza bila sisi kusaidia | wa-li-maliz-a + bila + sisi + ku-saidi-a | they finished without us helping |
Only the main verb anchors time and polarity. The ku- word remains an infinitive whether the main event is past, future, affirmative, or negative. Analytic hyphens disappear in normal spelling.
Juma alitoka ofisini bila kuzima kompyuta yake.
Juma left the office without turning off his computer.
Past a-li-tok-a locates the departure. Controlled ku-zim-a is understood to have Juma as its subject, but it contains no second a- or -li-.
Tutamaliza ukaguzi bila kusimamisha uzalishaji.
We will finish the inspection without stopping production.
Future tu-ta-maliz-a carries the projected time. The absence of stopping is expressed by bila, not by negating kusimamisha internally.
Default same-subject control
When no new actor appears, the main subject normally controls the infinitive.
Amina alijibu swali bila kusita hata kidogo.
Amina answered the question without hesitating at all.
Dereva aliendesha hadi Morogoro bila kupumzika.
The driver drove as far as Morogoro without resting.
Nilinunua tiketi mtandaoni bila kwenda kituoni.
I bought the ticket online without going to the station.
In all three, the person named or marked on the finite verb is also the understood subject of the infinitive. English uses an -ing form after “without”; Swahili uses its ordinary class-15 ku- form. There is no special “gerund ending” added to the stem.
Objects and extensions stay inside the infinitive's normal slots:
Tulipita karibu na Asha bila kumwona kwa sababu kulikuwa na giza.
We passed near Asha without seeing her because it was dark.
Ku-mw-on-a contains infinitive ku-, singular-human object -mw-, root -on-, and final -a. Object marking does not move after the verb to match English “seeing her.”
The broader contrast between semantic negation from bila and morphological kuto- is developed under negative infinitives.
Making a different subject explicit
If the actor of the bila event differs, place an overt noun phrase or independent pronoun before the infinitive.
Meneja alibadilisha ratiba bila wafanyakazi kujua.
The manager changed the schedule without the employees knowing.
The employees, not the manager, are the understood knowers. Wafanyakazi kujua is an infinitival clause with an overt subject.
Waliondoka mapema bila mimi kuwaona.
They left early without me seeing them.
Independent mimi disambiguates the subject; plural-human object -wa- appears in ku-wa-on-a. English uses object-form “me” before -ing, while Swahili uses the independent pronoun because it is semantically the embedded subject.
Mlango ulifunguka bila mtu yeyote kuugusa.
The door opened without anyone touching it.
Class 3 object marker -u- in ku-u-gus-a → kuugusa refers to mlango. The overt embedded subject is mtu yeyote.
Bila kufanya versus preventing an event
Bila kufanya reports that one event occurred unaccompanied by another. A negative purpose clause says that an action was taken to prevent another event.
Alifunga dirisha bila kuamsha mtoto.
She closed the window without waking the child.
Alifunga dirisha polepole ili asimwamshe mtoto.
She closed the window slowly so that she would not wake the child.
The first reports the nonoccurrence of waking as part of what happened. The second presents not waking the child as her purpose; it does not guarantee success. Negative subjunctive a-si-mw-amsh-e therefore cannot be substituted mechanically for bila kuamsha.
TAM and negation stay on the finite verb
Changing the main viewpoint does not alter the infinitive:
Asha anaweza kufanya hesabu hizi bila kutumia kikokotoo.
Asha can do these calculations without using a calculator.
Asha aliweza kufanya hesabu hizi bila kutumia kikokotoo.
Asha managed to do these calculations without using a calculator.
The controlled phrase remains bila ku-tumi-a while matrix a-na-weza and a-li-weza contribute different viewpoints.
A negative main clause creates a scope distinction:
Hakuondoka hotelini bila kulipa bili.
He did not leave the hotel without paying the bill.
This denies the combined possibility “leave without paying”; in ordinary context it implies that he paid before leaving or did not leave. It is not equivalent to Aliondoka bila kulipa bili “He left without paying.”
Register and alternatives
Bila + infinitive is concise and neutral. In (formal) prose, an overt embedded subject is useful whenever control might be misread. A full finite paraphrase can be clearer when time, modality, or polarity inside the subordinate situation must be independently specified: aliondoka huku wafanyakazi hawajui “she left while the employees did not know.” That is a different finite architecture, not an embellished infinitive.
Common Mistakes
Adding English-style -ing morphology
❌ Aliondoka bila sema-ing kwa heri.
Incorrect — Swahili uses the ordinary ku-infinitive, not an English suffix.
✅ Aliondoka bila kusema kwa heri.
She left without saying goodbye.
Giving a controlled infinitive finite TAM
❌ Tuliondoka bila tulilipa bili.
Incorrect — the accompanying action after bila is infinitival.
✅ Tuliondoka bila kulipa bili.
We left without paying the bill.
Hiding a different subject
❌ Meneja aliondoka bila kujua.
Wrong for the intended “without us knowing” — this normally means the manager did not know.
✅ Meneja aliondoka bila sisi kujua.
The manager left without us knowing.
Negating the infinitive redundantly
❌ Aliingia bila kutotumia ufunguo.
Wrong for simple “without using” — kuto- reverses the polarity again.
✅ Aliingia bila kutumia ufunguo.
She entered without using a key.
Key Takeaways
- Bila + ku-infinitive means “without doing”; bila supplies the negative relation.
- The main subject normally controls the infinitive, whose form does not copy person or TAM.
- Put a different embedded actor before the infinitive: bila watoto kujua.
- Object markers and extensions retain their ordinary positions inside the ku- word.
- Negative purpose with ili ... -si- expresses prevention or intention, not the same assertion as bila kufanya.
Now practice Swahili
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Swahili →Related Topics
- kwa + InfinitiveB1 — Use kwa before a class-15 infinitive to express means, manner, cause, thanks, apology, and the experiencer of an evaluation.
- kabla ya and baada ya + InfinitiveB1 — Build before-and-after phrases with kabla ya or baada ya plus an infinitive, and make subject control explicit when actors differ.
- bila and Without-ConstructionsA2 — Use bila with nouns and infinitives, identify the understood actor, and choose a finite alternative when another subject needs its own tense or polarity.
- Control and Subject Sharing with InfinitivesC1 — Interpret infinitives after modal, aspectual, and intention verbs as sharing a subject, and use finite or subjunctive clauses when a new subject is introduced.
- Negative Infinitives with kuto-B1 — Form negative infinitives with kuto-, preserve short-root support where required, and control their nominal and complement scope.