-ku- (ukanushi)
Past Negative -ku-
To say that an action did not happen in the past, Swahili uses the tense marker -ku-.
How It Works
The past negative -ku- is the direct opposite of the affirmative Past -li- tense. It means an action is completely finished and did not occur. To form it, use a negative subject prefix. For people, these are si- (I), hu- (you, replacing the affirmative u-), ha- (he/she, replacing the affirmative a-), hatu- (we), ham- (you all), and hawa- (they). For other noun classes, add ha- to the class's subject marker (e.g., hai-, hali-, haki-, haya-, hazi-). Then add -ku- and the verb stem.
Important Rules:
- The Final Vowel: The verb's final vowel stays as -a. Do not change it to -i like you do in the present tense. Verbs of Arabic origin (ending in -e, -i, or -u) also keep their final vowels unchanged (e.g., sikufikiri, sikusahau).
- Short Verbs and kuwa: Monosyllabic verbs (like kula or kuja) drop their infinitive ku- to avoid repeating the sound. So, "I didn't eat" is sikula, not *sikukula. This also applies to the highly frequent verbs To Be kuwa and Have with kuwa na, which become sikuwa (I was not) and sikuwa na (I did not have). (Note: While sikukula is incorrect in Standard Swahili, it is very common in colloquial Kenyan Swahili).
- Vowel Stems: Verbs starting with a vowel attach -ku- directly to the stem (e.g., sikuandika). For verbs like kwenda (to go) and kwisha (to finish), they drop their infinitive marker just like short verbs. The -ku- attaches to the stem (-enda, -isha), resulting in sikuenda or sikuisha. In speech and writing, the u and e/i often merge, creating sikwenda or sikwisha.
- Object Markers: If you are using an object marker, place it directly between the -ku- tense marker and the verb stem (e.g., sikumwona = I didn't see him, hatukukisoma = we didn't read it).
Nuance: If there is any expectation that the action might still happen, Swahili speakers strongly prefer the Not Yet Perfect -ja- (e.g., sijasoma = I haven't read yet).
Examples (5)
- Sikusoma kitabu.
I did not read the book.
Word by Word: I-did-not-read book.
The final vowel remains '-a'. It does not change to '-i'.
- Hawakuja shuleni leo.
They did not come to school today.
Word by Word: They-did-not-come school-to today.
The short verb 'kuja' (to come) drops its infinitive 'ku-', becoming 'hawakuja'.
- Hatukula nyama.
We did not eat meat.
Word by Word: We-did-not-eat meat.
The short verb 'kula' (to eat) drops its infinitive 'ku-', becoming 'hatukula'.
- Sikwenda sokoni.
I did not go to the market.
Word by Word: I-did-not-go market-to.
The verb 'kwenda' drops its infinitive marker. The past negative '-ku-' attaches directly to the stem '-enda' (sikuenda), and the vowels merge to form 'sikwenda'.
- Gari halikufika.
The car did not arrive.
Word by Word: Car it-did-not-arrive.
For non-human noun classes, the negative prefix is formed by adding 'ha-' to the subject marker. For class 5 (gari), 'ha-' + 'li-' becomes 'hali-'.
Common Mistakes
Changing the final vowel to '-i'.
Sikusomi kitabu.Sikusoma kitabu.Learners often confuse the past negative with the present negative (which changes '-a' to '-i'). In the past negative, the final vowel must remain '-a'.
Keeping the infinitive 'ku-' on short verbs.
Sikukula nyama.Sikula nyama.Unlike the affirmative past tense, Standard Swahili requires you to drop the infinitive 'ku-' from short verbs like 'kula' (to eat) and 'kuja' (to come). However, note that forms like 'sikukula' are frequently heard in colloquial Kenyan Swahili.
How It Connects
Learn This First
To form the past negative, you must first be familiar with the negative subject markers used in the present tense. You also need to understand the basic Swahili verb structure and how the past tense is expressed in the affirmative to correctly apply the negative -ku- marker.
Related Patterns
Learn Next
Patterns that build on this one.
Words in This Pattern
Practice -ku- (ukanushi) in Bubblegum
Poppy, your AI tutor, writes Swahili lessons at your level. Tap any grammar point in a lesson to see its full explanation.
