The negative completive denies that an event reached realization or that a state held: Musa bai zo ba “Musa did not come,” Ban sani ba “I do not know.” It uses a dedicated agreeing subject series inside the discontinuous frame ba ... ba, contrasting with the affirmative completive. It is not formed by placing an English-like not before an unchanged affirmative form.
All unlabelled examples are (neutral Nigerian Standard Hausa). Ordinary boko does not mark the tone and vowel length that distinguish these forms in speech. In the standard full construction, the second ba closes the negative scope.
The complete person paradigm
Use a finite predicate such as zo “come,” not the continuative verbal noun zuwa. First-person singular ban and third-person masculine singular bai are fused forms; the other rows are written as separate words.
| Person | Affirmative completive | Negative completive |
|---|---|---|
| 1st singular | na zo | ban zo ba |
| 2nd masculine singular | ka zo | ba ka zo ba |
| 2nd feminine singular | kin zo | ba ki zo ba |
| 3rd masculine singular | ya zo | bai zo ba |
| 3rd feminine singular | ta zo | ba ta zo ba |
| 1st plural | mun zo | ba mu zo ba |
| 2nd plural | kun zo | ba ku zo ba |
| 3rd plural | sun zo | ba su zo ba |
| impersonal | an zo | ba a zo ba |
Na gama aikin da rana.
I finished the work in the afternoon.
Ban gama aikin da rana ba; sai da dare.
I did not finish the work in the afternoon; it was not until night.
Kin aika wa Hauwa saƙon.
You sent Hauwa the message. (to one female)
Ba ki aika wa Hauwa saƙon ba.
You did not send Hauwa the message. (to one female)
The feminine singular contrast is kin → ba ki, not ba kin. The masculine singular contrast is ya → bai, not ba ya; ba ya belongs to the negative continuative.
Agreement remains after an overt noun
A noun names the subject, while the negative subject–TAM form still marks person, gender, number, polarity, and aspect.
Aisha ba ta buɗe shagon jiya ba.
Aisha did not open the shop yesterday.
Direban bai tsaya a tasharmu ba.
The driver did not stop at our station.
Baƙin ba su sami ɗaki a otel ɗin ba.
The visitors did not get a room at the hotel.
Feminine Aisha selects ba ta, masculine direban selects bai, and plural baƙin selects ba su. English has only did not for all three and therefore gives no help with Hausa agreement.
The impersonal form suppresses a specific agent:
Ba a buɗe ofishin ranar Lahadi ba.
The office was not opened on Sunday / People did not open the office on Sunday.
This is not third-person plural ba su. Use impersonal ba a ... ba when the actor is unknown, irrelevant, or deliberately backgrounded.
What the completive denial means
With an active verb, the construction normally denies a bounded occurrence or completed result.
Mun sayi tikiti da safe.
We bought tickets in the morning.
Ba mu sayi tikiti da safe ba saboda layin ya yi tsawo.
We did not buy tickets in the morning because the queue was long.
With a state-like verb, the same completive viewpoint can deny a state that would otherwise count as established. Natural English often uses a present tense.
Ban san sabon adireshinsu ba.
I do not know their new address.
Musa bai fahimci abin da malamar ta ce ba.
Musa did not understand what the teacher said.
That is why “negative completive” should not be memorized as “past negative.” Lexical aspect and context determine whether English says did not know, does not know, has not understood, or another natural equivalent. Hausa grammar presents the state or event as unrealized.
The final ba closes the scope
The first negative element and the clause-final ba form one construction. Objects, place phrases, time expressions, and other material within the denied event normally come before the closing ba.
Ba ku ga sabon ginin daga babbar hanya ba.
You all did not see the new building from the main road.
Bai kawo mana takardun kafin taron ba.
He did not bring us the documents before the meeting.
In a subordinate clause, the closing ba comes before the boundary of that clause:
Idan ba ka karanta umarnin ba, kada ka kunna na’urar.
If you have not read the instructions, do not switch on the device. (to one male)
The first clause is idan + ba ka karanta umarnin ba. The prohibition in the second clause uses kada and has no final negative ba. Each construction keeps its own frame.
Completed event versus ongoing or habitual nonoccurrence
The negative completive contrasts sharply with the negative continuative.
| Construction | Example | Viewpoint |
|---|---|---|
| negative completive | ba su kira ni ba | they did not call me on the relevant occasion |
| negative continuative | ba sa kirana | they are not calling me / they do not call me |
Ba su yi taro jiya ba.
They did not hold a meeting yesterday. (one bounded occasion)
Ba sa yin taro ranar Juma’a.
They do not hold meetings on Fridays. (regular pattern)
The plural forms are the quickest diagnostic: completive ba su ... ba, continuative ba sa .... The predicate also changes from finite yi to continuative yin before its noun object.
Negation in questions, focus, and relative clauses
Positive Hausa distinguishes plain and relative completive subject forms in focus and wh-constructions. In the negative completive, that positive distinction is largely neutralized: use the negative series and close its scope with ba.
Me ba ka saya a kasuwa ba?
What did you not buy at the market? (to one male)
Waɗannan fayilolin ne ba su kawo ba.
It was these files that they did not bring.
Na kira mutanen da ba su halarci taron ba.
I called the people who did not attend the meeting.
The object question does not preserve affirmative relative ka inside a generic wrapper. The focused and relative examples likewise use ba su ... ba, not affirmative relative suka.
Focus can also change what is denied:
Musa bai sayi motar ba.
Musa did not buy the car. (the purchase event is denied)
Ba motar ba ce Musa ya saya; babur ne.
It was not the car that Musa bought; it was a motorcycle. (the object is corrected, but a purchase occurred)
The first is negative completive. The second uses a focused nominal negative ba motar ba ce and an affirmative relative completive ya saya because the buying itself is presupposed. Placement determines scope.
A natural dialogue correction
—Aisha ta aika rahoton jiya? —A’a, ba ta aika shi ba; ta ce za ta gama yau.
—Did Aisha send the report yesterday? —No, she did not send it; she said she would finish today.
The noun subject in the question is feminine, so the correction uses ba ta. The object is understood as masculine rahoto, hence direct object shi. Final ba closes the negative completed event before the explanation begins.
Practice: change polarity without changing the person
Convert each affirmative completive to its negative counterpart.
- Na dawo da wuri. → Ban dawo da wuri ba.
- Ka rufe ƙofar. → Ba ka rufe ƙofar ba.
- Kin ga likitar. → Ba ki ga likitar ba.
- Ya karɓi saƙon. → Bai karɓi saƙon ba.
- Mun sami mota. → Ba mu sami mota ba.
- Kun fahimci tambayar. → Ba ku fahimci tambayar ba.
- Sun kammala aikin. → Ba su kammala aikin ba.
- An gyara famfon. → Ba a gyara famfon ba.
Notice that only the 1st singular and 3rd masculine singular are written as fused ban/bai.
Common Mistakes
1. Using the affirmative masculine marker after ba.
❌ Musa ba ya zo jiya ba.
Incorrect for the intended completed-event denial; ba ya belongs to the negative continuative series.
✅ Musa bai zo jiya ba.
Musa did not come yesterday.
2. Keeping affirmative kin in the feminine negative.
❌ Ba kin ga saƙon ba.
Incorrect negative-completive subject form.
✅ Ba ki ga saƙon ba.
You did not see the message. (to one female)
3. Omitting the closing ba.
❌ Yaran ba su dawo gida.
Incorrect as a full standard negative completive; the frame is unfinished.
✅ Yaran ba su dawo gida ba.
The children did not return home.
4. Mixing a continuative verbal noun into the completive.
❌ Ba mu zuwa kasuwa jiya ba.
Incorrect mixture for ‘we did not go to the market yesterday.’
✅ Ba mu je kasuwa jiya ba.
We did not go to the market yesterday.
5. Preserving affirmative relative suka under negation.
❌ Waɗanne kaya ba suka kawo ba?
Incorrect standard negative-completive agreement in an object question.
✅ Waɗanne kaya ba su kawo ba?
Which goods did they not bring?
Key Takeaways
- The full paradigm is ban, ba ka, ba ki, bai, ba ta, ba mu, ba ku, ba su, ba a ... ba.
- Use a finite predicate and keep the closing ba at the end of the denied scope.
- Overt noun subjects still require agreement: Aisha ba ta, direban bai, baƙin ba su.
- Active verbs usually deny completed events; state-like verbs can yield present English translations such as ban sani ba “I do not know.”
- Negative completive forms also appear in wh-, focus-, and relative environments; positive plain–relative contrasts are largely neutralized under negation.
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Start learning Hausa →Related Topics
- The ba ... ba Negative FrameA1 — Build Hausa negatives with the discontinuous ba ... ba frame while recognizing TAM forms that use a different negative pattern.
- Negative ContinuativeA2 — Use the ba na, ba ka, ba kya series to deny ongoing actions, open states, locations, and regular activities without final ba.
- Negative Subject Pronoun SetsA2 — Distinguish Hausa negative completive, continuative, future, potential, and subjunctive subject patterns instead of applying one universal ba rule.
- Completive Meaning with Active VerbsA2 — Understand how Hausa plain-completive markers present actions, processes, and changes as bounded wholes rather than simply marking past tense.
- Completive Meaning with Stative VerbsA2 — See why Hausa completive forms can express present knowledge, ability, perception, and comparison with stative predicates.
- Plain versus Relative Completive: PresuppositionB2 — Understand how plain and relative completives divide assertion from background in Hausa without turning presupposition into a mechanical tense rule.