Hausa sani means “know” and is a central example of a stative verb. Its ordinary present meaning commonly uses the completive: na sani “I know,” na san Amina “I know Amina.” It also reduces to san before an overt object. Both facts resist English habits: English present tense does not predict Hausa continuative aspect, and invariant English know does not predict Hausa object-conditioned form.
All unlabelled examples are (neutral Nigerian Standard Hausa). Ordinary boko omits tone and vowel length. Sani is treated as irregular or residual in grade descriptions; it should not be forced into a canonical Grade 2 pattern.
Principal parts and object environments
| Environment | Finite form | Example frame |
|---|---|---|
| No following object | sani | Na sani. “I know.” |
| Noun object | san | Na san mutumin. “I know the man.” |
| Direct-object pronoun | san | Na san shi. “I know him/it.” |
| Finite content clause | san or sani | Na san cewa zai zo. / Na sani cewa zai zo. “I know that he will come.” |
| Embedded question | san (usual) | Na san inda yake. “I know where he is.” |
| Strong verbal noun | sani; construct sanin | sanin doka “knowledge of the law” |
Unlike gani, which distinguishes ga before a noun and gan before a pronoun, sani uses san before both. The final -i is obligatorily absent before a noun or object pronoun. With no following complement, the full form sani appears. Before a sentential complement, however, both san and sani occur; san is the compact, very common choice.
Na sani, amma ina son in sake tabbatarwa.
I know, but I want to confirm again. (no following object)
Mun san wannan likitan tun muna yara.
We have known this doctor since we were children. (noun object)
Hauwa ta san su duka, domin sun yi aiki tare.
Hauwa knows all of them because they worked together. (pronoun object)
Ban san inda aka ajiye makullin ba.
I do not know where the key was put. (embedded question)
Na sani cewa za su dawo gobe.
I know that they will return tomorrow. (full form before a sentential complement)
Why a completive can mean present “know”
With an active verb, the completive often presents a bounded event as complete. With a stative predicate such as sani, it can present an established state: knowledge has been attained and holds now. Thus na san amsar normally means “I know the answer,” not only “I knew the answer.” Time expressions decide whether the state belongs to the present or past.
Na san amsar yanzu; ka ba ni dama in yi bayani.
I know the answer now; give me a chance to explain. (present established state)
A lokacin ban san gaskiyar lamarin ba.
At that time I did not know the truth of the matter. (past state from context)
Bayan taron za su san dalilin canjin.
After the meeting they will know the reason for the change. (future state)
The neutral present is not *ina sani. A continuative can arise in marked constructions that deliberately present knowledge as developing, repeated, or otherwise internally viewed, but Hausa usually expresses that meaning with additional material such as ƙara sanin... “get to know more / know increasingly well.” Do not invent a routine progressive merely because English says I am knowing in no standard context either.
Yayin da take aiki da su, tana ƙara sanin halayensu.
As she works with them, she is getting to know their ways better. (developing knowledge with ƙara sanin)
For the larger aspectual logic, see Completive Meaning with Stative Verbs. The construction presents a state as established; it does not secretly turn “know” into a past event.
TAM and polarity
| Construction | No object | With object/content |
|---|---|---|
| Established-state completive | na sani | na san amsar |
| Future | zan sani | zan san amsar |
| Subjunctive | in sani | in san amsar |
| Negative completive/state | ban sani ba | ban san amsar ba |
| Relative completive | wanda na sani | abin da na san dalilinsa |
Ka yi mini bayani dalla-dalla domin in san abin da zan yi.
Explain it to me in detail so that I know what to do. (to one male; purpose subjunctive)
Ba za ka san sakamakon ba sai an gama ƙirga ƙuri’un.
You will not know the result until the votes have been counted. (to one male)
Wannan shi ne mutumin da na sani a tsohon ofishinmu.
This is the man I knew at our old office. (relative clause)
Negative present “do not know” is normally ban sani ba / ba ta sani ba / ba su sani ba. This is negative completive morphology around a state, including the closing ba. Do not replace it with negative continuative *ba na sani as the neutral expression.
What can be known?
Sani takes people, facts, places/routes, skills framed as knowledge, finite content with cewa, and embedded questions. It does not behave exactly like English know in every construction.
Ta san hanyar zuwa sabon asibitin.
She knows the way to the new hospital.
Mun san cewa farashin ya canja, amma ba mu san dalili ba.
We know that the price changed, but we do not know the reason.
Ka san yadda ake gyara irin wannan famfo?
Do you know how this kind of tap is repaired? (to one male)
For practical ability, Hausa often uses iya: ta iya tuƙi “she can drive/knows how to drive.” Ta san tuƙi may concern knowledge of driving, but it is not a universal substitute for ability. For recognizing a face, voice, or object, use gane; for finding out or learning a new fact, gano, samu labari, or another eventive expression may be better. English uses know across all these relations more freely than Hausa uses sani.
Aisha ta iya tuƙi, amma ba ta san wannan hanyar ba.
Aisha can drive, but she does not know this route.
Verbal noun and nominal knowledge
The strong verbal noun is written sani; before a dependent noun it appears as sanin. This construction is common in (formal/academic) prose.
Sanin dokokin hanya yana taimaka wa direba ya guji haɗari.
Knowledge of traffic rules helps a driver avoid danger. (formal)
This sanin is not a finite form meaning “is knowing.” Its noun-like syntax is visible in the linker and in its role as the subject of yana taimakawa. In everyday conversation, a finite clause is often lighter than a dense nominalization.
There is no routine benefactive/recipient principal part of sani. English phrases such as “know it for me” are themselves unusual; Hausa instead chooses the intended event—nemo mini bayani “find information for me,” tabbatar mini “confirm for me,” or gaya mini “tell me.”
Common Mistakes
1. Keeping sani before an object
❌ Na sani wannan mutumin.
Incorrect finite form before a following object.
✅ Na san wannan mutumin.
I know this man.
2. Using the continuative for neutral present knowledge
❌ Ina sani inda take.
Incorrect as the default expression ‘I know where she is.’
✅ Na san inda take.
I know where she is.
3. Dropping closing ba in the negative state
❌ Ban san amsar.
Incomplete standard negative completive.
✅ Ban san amsar ba.
I do not know the answer.
4. Using sani for practical ability without regard to frame
❌ Yaron ya san iyo sosai.
Not the neutral ability frame for the intended ‘The boy can swim well.’
✅ Yaron ya iya iyo sosai.
The boy can swim very well.
5. Treating sanin as a finite present form
❌ Musa ya sanin dokar.
Incorrect—sanin is a verbal-noun construct.
✅ Musa ya san dokar.
Musa knows the rule.
Key Takeaways
- Use sani with no following complement and reduced san before a noun or object pronoun. Before a sentential complement, both san and sani are attested.
- The completive commonly expresses a current established state: na sani / na san amsar.
- Neutral negative “do not know” is ban sani ba / ban san ... ba, not a routine continuative.
- The strong verbal noun gives sanin doka, especially in formal nominal style.
- Choose iya for practical ability and gane for recognition rather than translating every English know with sani.
Related Topics
- Grade 0 and Irregular Derived PatternsC1 — Use Grade 0 as a precise residual classification while learning the object frames, verbal nouns, and derived forms of exceptional verbs lexically.
- The Three Object EnvironmentsA2 — Choose Hausa verb forms by whether no object, a noun direct object, or a direct-object pronoun immediately follows, while treating indirect objects separately.
- Verbal Nouns and Grade MembershipA2 — Use Hausa verb grades to anticipate verbal-noun patterns while learning the strong, weak, and sometimes multiple forms each lexical verb actually permits.
- Completive Meaning with Stative VerbsA2 — See why Hausa completive forms can express present knowledge, ability, perception, and comparison with stative predicates.
- Continuative with Stative PredicatesC1 — Use Hausa continuative forms for posture, residence, temporary condition, wanting, and experience while distinguishing state from ongoing action.