Standard Swahili does not negate a bare imperative by placing a separate word before it. A prohibition uses the negative subjunctive: u-si-som-e → usisome “do not read” to one listener, and m-si-som-e → msisome to several listeners.
This architecture simultaneously marks the intended actor, negation, and mood. It is therefore more informative than English don't + verb, but it also creates three opportunities for transfer errors: using an indicative negative prefix, retaining final -a, or adding affirmative plural -eni.
The singular and plural templates
For a regular -a verb, use:
singular: u- + -si- + stem + -e
plural: m- + -si- + stem + -e
The initial u- and m- are affirmative-shaped second-person subject concords inside a negative subjunctive construction. Negation is carried by -si-; number is carried by the subject concord, not by a final plural suffix.
| Analytic build | Finished prohibition | Meaning |
|---|---|---|
| u-si-som-e | usisome | do not read (one listener) |
| m-si-som-e | msisome | do not read (several) |
| u-si-gus-e | usiguse | do not touch (one) |
| m-si-gus-e | msiguse | do not touch (several) |
| u-si-end-e | usiende | do not go (one) |
| m-si-j-e | msije | do not come (several) |
| u-si-jib-u | usijibu | do not answer (one) |
| m-si-subir-i | msisubiri | do not wait (several) |
The same contrast can be summarized against the affirmative commands learners already know:
| Verb | Affirmative singular | Negative singular | Affirmative plural | Negative plural |
|---|---|---|---|---|
| kusoma | soma | usisome | someni | msisome |
| kujibu | jibu | usijibu | jibuni | msijibu |
| kuja | njoo | usije | njooni | msije |
| kula | kula | usile | kuleni | msile |
The forms are single words. Hyphens appear only in the analysis. Notice that usi- and msi- are not indivisible negative words: u-/m- identify the addressee set, while -si- supplies negation.
Usiguse sufuria hiyo; bado ina moto.
Do not touch that pot; it is still hot.
Msifunge mlango mpaka mlinzi arudi.
Do not close the door until the guard returns, any of you.
The singular has u-si-gus-e; the plural has m-si-fung-e. English uses the same don't for both, so the listener number must be chosen independently in Swahili.
Final -e and non-a verbs
Regular Bantu verbs ending in -a change that vowel to subjunctive -e: fungua → usifungue, andika → msiandike. The last vowel is a mood signal, not merely pronunciation.
Usifungue kiambatisho hicho kabla hujathibitisha aliyetuma.
Do not open that attachment before verifying who sent it.
The build is u-si-fungu-e. A negative-present form such as hufungui has a different ending because it describes what the listener does not do; it does not issue a command.
Msiandike majibu kwa penseli; tumieni kalamu ya wino.
Do not write the answers in pencil; use an ink pen.
Verbs whose lexical form ends in -i, -u, or -e keep that vowel. There is no productive replacement with -e.
Usijibu ujumbe huo mpaka tuzungumze na wakili.
Do not reply to that message until we speak with the lawyer.
Msisubiri nje wakati mvua inanyesha; ingieni ukumbini.
Do not wait outside while it is raining; come into the hall.
The builds are u-si-jib-u and m-si-subir-i. The contrast is lexical: jibu and subiri never had regular final -a to replace.
Short verbs reshape inside the subjunctive
Short and high-frequency verbs do not simply preserve the positive bare commands kula, kunywa, njoo, and nenda. The negative construction supplies prefixes, and the verb takes its subjunctive stem shape.
| Positive singular | Negative analysis | Negative singular |
|---|---|---|
| kula | u-si-l-e | usile |
| kunywa | u-si-nyw-e | usinywe |
| njoo | u-si-j-e | usije |
| nenda | u-si-end-e | usiende |
Usile keki yote; wageni wengine bado hawajafika.
Do not eat the whole cake; some of the guests have not arrived yet.
Msije ofisini kesho; jengo litakuwa limefungwa.
Do not come to the office tomorrow; the building will be closed.
There is no clean way to derive usije from the surface command njoo by adding “not.” Learn these as members of their subjunctive paradigms and connect them to the irregular imperative families.
Object markers stay after -si-
If the prohibited action has a bound object, that marker takes its normal inner position between -si- and the stem:
subject + -si- + object + stem
| Analytic build | Finished form | Meaning |
|---|---|---|
| u-si-mw-ambi-e | usimwambie | do not tell him/her |
| m-si-wa-sumbu-e | msiwasumbue | do not bother them |
| u-si-i-wek-e | usiiweke | do not put it (class 9) |
| m-si-zi-fungu-e | msizifungue | do not open them (class 10) |
Usimwambie Asha habari hizo kabla familia yake haijamjulisha.
Do not tell Asha that news before her family informs her.
Msizifungue pakiti hizi mpaka meneja afike.
Do not open these packages until the manager arrives, any of you.
The adjacent ii in usiiweke is correct: -si- ends in i and class 9 object -i- follows it. Standard spelling preserves both vowels because they are different morphemes.
Nimehifadhi nakala hiyo; usinipe karatasi nyingine.
I have saved that copy; do not give me another sheet of paper.
Short kupa uses root p- in u-si-ni-p-e. Infinitive support ku- does not remain inside this object-bearing prohibition.
Prohibition versus negative statement
Compare a statement about behavior with an attempt to stop behavior:
Huchelewi kazini siku hizi.
You are not late for work these days.
Usichelewe kazini kesho; tuna ukaguzi saa mbili.
Do not be late for work tomorrow; we have an inspection at eight.
Hu-chelew-i is second-person singular negative present. U-si-chelew-e is a prohibition. English may use “don't” for a habitual statement (“You don't arrive late”) as well as a command (“Don't arrive late”), but Standard Swahili distinguishes the two morphologically.
The same negative-subjunctive form can also occur inside a request or subordinate clause rather than as a standalone command.
Naomba usipige simu baada ya saa nne usiku.
Please do not call after ten at night.
This is gentler than an isolated Usipige simu! because naomba frames it as a request. Bare prohibitions are normal in warnings and urgent (informal) coordination; fuller framing is often preferable in customer service, workplace, and (formal) contexts.
Public notices often avoid addressing a listener directly. Hairuhusiwi + infinitive “it is not permitted to...” is institutional and (formal), while epuka + noun/infinitive “avoid...” is common in instructions.
Hairuhusiwi kupiga picha ndani ya chumba hiki.
Photography is not permitted inside this room.
Epuka kuweka simu karibu na maji.
Avoid placing the phone near water.
These alternatives change the interpersonal framing: hairuhusiwi invokes a rule, epuka recommends avoidance, and usi-/msi- directly addresses one or more listeners.
Common Mistakes
Combining indicative hu- with prohibitive -si-
❌ Husiguse swichi hiyo yenye hitilafu.
Incorrect — a singular prohibition begins with subject u-, followed by -si-.
✅ Usiguse swichi hiyo yenye hitilafu.
Do not touch that faulty switch.
Retaining final -a on a regular verb
❌ Usifungua dirisha wakati kiyoyozi kimewashwa.
Incorrect — regular final -a becomes subjunctive -e.
✅ Usifungue dirisha wakati kiyoyozi kimewashwa.
Do not open the window while the air conditioner is on.
Changing a lexical non-a ending
❌ Usisubire barabarani baada ya giza kuingia.
Incorrect — kusubiri retains lexical final -i.
✅ Usisubiri barabarani baada ya giza kuingia.
Do not wait by the road after dark.
Adding affirmative plural -eni
❌ Msiingieni kwenye chumba hicho bila ruhusa.
Incorrect — plural m- already marks the listeners in a prohibition.
✅ Msiingie kwenye chumba hicho bila ruhusa.
Do not enter that room without permission, any of you.
Using the negative present as a command
❌ Hupigi picha hapa!
Wrong form for a direct prohibition — this normally states that you do not take pictures here.
✅ Usipige picha hapa!
Do not take pictures here!
Key Takeaways
- Singular prohibitions use u-si-; plural prohibitions use m-si-.
- Regular final -a becomes subjunctive -e, while lexical -i, -u, and -e remain.
- Short verbs use forms such as usile, usinywe, usije, and usiende.
- Object markers follow -si- inside the same finite word.
- Prohibitions are negative-subjunctive forms, not negative-present verbs and not affirmative plurals in -eni.
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Start learning Swahili →Related Topics
- Imperatives with Object MarkersB1 — Insert an object marker before the stem and use the subjunctive-shaped command form, as in niambie, msaidie, and niambieni.
- Irregular and Monosyllabic ImperativesB1 — Form direct commands with njoo, nenda, lete, kula and kunywa, and rebuild their plural and negative counterparts correctly.
- Negative Subjunctive Formation with -si-B1 — Build the negative subjunctive with an affirmative subject concord, -si-, an optional object marker, and the appropriate subjunctive stem ending.
- Using the Negative Subjunctive in Purpose, Wishes and CommandsB1 — Choose negative-subjunctive forms in purpose clauses, wishes, selected complements, and commands by recognizing the clause relationship before translating not.
- Polite Requests with tafadhali, naomba and SubjunctivesB1 — Choose among bare imperatives, tafadhali, naomba, and subject-marked subjunctives to match the addressee, relationship, burden, and setting.