Ku- Retention in Short Verbs

The rule of retaining ku- applies to a small but highly frequent group of verbs. While it helps provide enough syllables for pronunciation, its retention is a grammatical rule tied to specific tenses that must be memorized.

Common Short Verbs:

• -la (eat) → kula
• -nywa (drink) → kunywa
• -ja (come) → kuja
• -fa (die) → kufa
• -wa (be) → kuwa
• -pa (give) → kupa

Two vowel-initial verbs also follow this pattern using kw-: -enda (go → kwenda) and -isha (finish → kwisha).

When is ku- retained?
The ku- is kept in the following common tenses to maintain the word's rhythm:

• Present -na-: anakula (he is eating)
• Past -li-: alikula (he ate)
• Future -ta-: atakula (he will eat)
• Perfect -me-: amekula (he has eaten)
• Conditionals -nge- and -ngali-: angekula (he would eat)
• Future negative: hatakula (he will not eat)

Commands (Imperatives):
While regular verbs drop the infinitive ku- in commands, monosyllabic verbs retain it. For example, Kula! (Eat!) and Kunywa! (Drink!). This also applies to plural commands, such as Kuleni! (Eat all of you!) and Kunyweni! (Drink all of you!). Note that some verbs have irregular commands: -ja becomes Njoo! (Come!) and -enda becomes Nenda! (Go!). The verb -pa (give) is a major exception; because it always requires an object marker, it drops the ku- and ends in -e (e.g., Nipe! - Give me!, Mpe! - Give him/her!).

When does ku- drop?
The ku- has no actual meaning in these conjugated verbs. It drops in the following situations:

1. With Object Markers: If you insert an object marker, the ku- drops. Anakula (He is eating) becomes Anakila (He is eating it, referring to chakula, food). The verb -pa (give) is unique because it always requires an object marker, which causes the infinitive ku- to drop (e.g., ananipa - he gives me). Note that in forms like anakupa (he gives you), the -ku- is the second-person object marker, not the infinitive prefix.
2. In Certain Tenses: Tenses like -ki- (akila - if he eats), the present negative (hali - he does not eat), the subjunctive (ale - that he may eat), the narrative -ka- (akala - and then he ate), and the habitual hu- (hula - he usually eats) cause the ku- to drop.

A Common Point of Confusion:
In the past negative, the form for "he did not eat" is hakula. Learners often think this is the retained infinitive ku-, but it is actually the negative past tense marker -ku- attaching directly to the root -la.

Note: While Standard Swahili strictly drops the ku- in tenses like the conditional (akila) and negative past (hakula), in regional Kenyan Swahili, you will frequently hear it retained (akikula, hakukula) to simplify the grammar.