Negative Infinitives with kuto- | Swahili Grammar

A negative infinitive uses kuto- to mean “not to do” or “not doing”: kusoma → kutosoma, kuandika → kutoandika. It has no ordinary subject marker or TAM marker. Instead, it packages a negative event as a nonfinite complement or a class 15 verbal noun.

This construction answers a different question from a finite negative such as hasomi “he/she does not read.” Kutosoma does not identify who fails to read or when; a matrix verb, possessive phrase, or context supplies those interpretations. English can place “not” before to or an -ing form, but Swahili inserts -to- inside one written word.

Core formation: kuto- before the stem

For an ordinary polysyllabic verb, the compact pattern places -to- between infinitive ku- and the stem. The final vowel remains whatever belongs to the verb.

Affirmative	Analytic negative	Finished negative	Meaning
kusoma	ku-to-som-a	kutosoma	not to read / not reading
kufanya	ku-to-fany-a	kutofanya	not to do / not doing
kuandika	ku-to-andik-a	kutoandika	not to write / not writing
kuona	ku-to-on-a	kutoona	not to see / not seeing
kujibu	ku-to-jibu	kutojibu	not to answer / not answering
kusafiri	ku-to-safiri	kutosafiri	not to travel / not traveling

The analysis has hyphens; Standard spelling does not. Vowel-initial andika and ona produce compact kutoandika and kutoona. A fuller variant that retains the original infinitive prefix after -to- is also well attested in careful usage: kutokuandika, kutokuona, kutokufanya. These are one-word variants, not errors; this page uses the compact pattern consistently. Borrowed-final jibu and safiri retain -u and -i because kuto- does not trigger present-negative final-vowel replacement.

Ni muhimu kutotaja majina ya wagonjwa katika ripoti ya umma.

It is important not to mention patients' names in the public report.

Daktari alipendekeza kutosafiri hadi homa itakapopungua.

The doctor recommended not traveling until the fever subsides.

Kutojibu barua hiyo kwa wakati kunaweza kuchelewesha malipo.

Not answering that letter on time may delay payment.

💡

Think ku-to-stem, not “not + unchanged infinitive” as two words. The finished forms kutofanya, kutoandika, and kutojibu each form one grammatical word.

Short and exceptional roots keep support ku-/kw-

Monosyllabic roots require the support material visible in their infinitives. After negative kuto-, they therefore show an additional ku- before the short root. The frequent vowel-initial verb kwenda is not monosyllabic, but it likewise retains its kw- stem marker in kutokwenda.

Verb	Negative build	Finished form
kula (eat)	ku-to-ku-l-a	kutokula
kunywa (drink)	ku-to-ku-nyw-a	kutokunywa
kuja (come)	ku-to-ku-j-a	kutokuja
kuwa (be)	ku-to-ku-w-a	kutokuwa
kwenda (go)	ku-to-kw-end-a	kutokwenda

This is genuinely harder than the ordinary pattern: surface kuto- does not by itself tell you whether a following ku/kw is short-root support or part of some other morphology. Memorize the high-frequency forms as complete words.

Kutokula kabla ya safari ndefu kulimfanya Asha ajisikie dhaifu.

Not eating before the long journey made Asha feel weak.

Aliomba radhi kwa kutokuja kwenye sherehe ya mtoto wetu.

She apologized for not coming to our child's celebration.

Kutokuwa na nakala ya mkataba kulitatiza mazungumzo yetu.

Not having a copy of the contract complicated our discussion.

The last example contains negative infinitive kutokuwa followed by possessive na. It does not take a fused present-possession ending; na remains a separate word because the embedded predicate is kuwa na.

Objects and extensions remain inside the word

Object markers follow kuto- and precede the root, just as the object slot precedes the root in other verb forms.

Kutompigia mama yako simu kutamfanya awe na wasiwasi.

Not calling your mother will make her worry.

The build is ku-to-m-pig-i-a: class 1 human object -m- plus applicative -i- in pigia. The ordinary spelling kutompigia preserves one word.

Meneja alisisitiza kutoyafungua masanduku kabla ya ukaguzi.

The manager insisted on not opening the boxes before the inspection.

Class 6 object marker -ya- refers to masanduku: ku-to-ya-fungu-a → kutoyafungua. Negative -to- does not displace the object slot or remove an extension.

Class 15 nominal behavior

Like affirmative infinitives, negative infinitives can head noun-like phrases and trigger class 15 ku- agreement. English often translates them with an -ing clause or an abstract noun such as “failure.”

Kutolala vya kutosha kunapunguza uwezo wa kuzingatia darasani.

Not sleeping enough reduces the ability to concentrate in class.

The negative infinitive is the subject. Class 15 concord ku- appears on ku-na-pungu-z-a “reduces.”

Kutojibu kwake kulinitia wasiwasi kwa sababu huwa anajibu haraka.

His not replying worried me because he usually replies quickly.

Possessive class 15 kwake identifies whose nonresponse is being discussed. It does not become a subject prefix inside kutojibu.

Tulizungumza kuhusu kutofika kwa vifaa kwa wakati uliopangwa.

We discussed the equipment's failure to arrive at the scheduled time.

The kwa phrase can identify the logical subject of a nominalized event, but long strings of such phrases become ambiguous. In careful (formal) writing, a finite clause may be clearer when several participants must be tracked.

💡

A negative infinitive has no person or tense slot. If the reader must know exactly who did not act and when, supply that information in the surrounding phrase or choose a finite clause.

Scope under a matrix predicate

The position of negation determines which proposition is denied. Negating the infinitive says that the intended, promised, recommended, or possible action is a non-action. Negating the matrix verb denies the attitude or decision itself.

Baraka aliamua kutohudhuria mkutano wa jioni.

Baraka decided not to attend the evening meeting.

Baraka hakuamua kuhudhuria mkutano wa jioni; bado anafikiria.

Baraka did not decide to attend the evening meeting; he is still thinking.

In the first, the decision exists and its content is kutohudhuria. In the second, negative past ha-ku-amu-a scopes over “decide”; it does not say what Baraka will ultimately do.

Shahidi aliahidi kutofichua jina la mtoto kwa waandishi wa habari.

The witness promised not to reveal the child's name to journalists.

Mashine inaweza kutofanya kazi ikiwa joto litazidi kiwango hiki.

The machine may fail to work if the temperature exceeds this level.

With inaweza kutofanya kazi, the possibility concerns nonfunctioning. Compare haiwezi kufanya kazi “it cannot work,” where the matrix modal itself is negative. These are not interchangeable: “may not work” expresses a possibility, while “cannot work” expresses impossibility.

Kuto- versus bila

Kuto- forms the negative version of an event as a complement or noun. Bila + affirmative infinitive presents a main event as occurring without an accompanying event.

Kutowasha simu wakati wa mahojiano ni ishara ya heshima.

Not switching on a phone during an interview is a sign of respect.

Aliingia katika chumba cha mahojiano bila kuwasha simu yake.

She entered the interview room without switching on her phone.

The first makes non-switching-on the topic. The second asserts entering and describes the absent accompaniment. See without-constructions for control and different-subject patterns.

Register

Negative infinitives are neutral, but dense strings such as kutowasilishwa kwa nyaraka kwa wakati are especially common in (formal) administrative and academic prose. In (informal) conversation, speakers often choose a finite clause when the actor is specific: Hakuleta nyaraka kwa wakati “He did not bring the documents on time.” The shorter finite form can be clearer without being less grammatical.

Common Mistakes

Writing kuto as a separate English-style not

❌ Ni bora kuto kusema siri hiyo mbele ya watoto.

Incorrect spacing — the negative infinitive is one word.

✅ Ni bora kutosema siri hiyo mbele ya watoto wadogo.

It is better not to mention that secret in front of the young children.

Adding a finite subject marker inside kuto-

❌ Aliamua kutohahudhuria mkutano wa jioni.

Incorrect — a negative infinitive has no finite subject prefix after kuto-.

✅ Aliamua kutohudhuria mkutano wa jioni.

He decided not to attend the evening meeting.

Dropping short-root support

❌ Kutola kwa saa nane kabla ya upasuaji ni agizo la daktari.

Incorrect — short root -la keeps support ku- after kuto-.

✅ Kutokula kwa saa nane kabla ya upasuaji ni agizo la daktari.

Not eating for eight hours before surgery is the doctor's instruction.

Changing a borrowed final vowel

❌ Aliahidi kutojiba maswali kuhusu uchunguzi huo.

Incorrect — kujibu retains lexical final -u in kutojibu.

✅ Aliahidi kutojibu maswali kuhusu uchunguzi huo kabla ya kikao.

He promised not to answer questions about that investigation before the meeting.

Negating the wrong predicate

❌ Hakupanga kuhudhuria kikao cha mwisho.

Wrong scope for ‘he planned not to attend’ — this says he did not plan to attend.

✅ Alipanga kutohudhuria kikao cha mwisho baada ya ratiba kubadilika.

He planned not to attend the final session after the schedule changed.

Key Takeaways

Insert -to- after class 15 ku-: kusoma → kutosoma, kuandika → kutoandika.
Short roots retain support in kutokula, kutokuja, and kutokuwa; exceptional kwenda gives kutokwenda.
Object markers and extensions remain between kuto- and the root.
Negative infinitives behave as class 15 nouns and contain no person or TAM marking.
Negating a complement and negating its matrix predicate produce different scope.

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