A Valency Map for Extended Verbs | Swahili Grammar

Valency is the number and type of participants licensed by a predicate. Swahili extensions are not decorative meanings added after an English sentence has already been built: they reorganize who becomes subject, object, or oblique. This page gives an inside-out diagnostic for causative, applicative, reciprocal, stative, and passive forms.

The labels agent, causer, causee, patient, beneficiary, oblique, valency, and promotion are (academic). All example sentences themselves are neutral current Standard Swahili unless otherwise marked.

Step 1: Map the underived verb

Start with the lexical root and ask which participants it requires before analyzing any suffix.

Amina aliandika barua baada ya chakula cha mchana.

Amina wrote a letter after lunch.

For andika, the ordinary map is:

subject: Amina — agent/writer
object: barua — theme, the thing written

The verb is transitive: two core participants. In a-li-andik-a, a- marks the subject, -li- past, andik- the root, and -a the final vowel. There is no object marker because the postverbal theme is new and inanimate.

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Never diagnose an extension from its English translation alone. First write the base verb's participant map; then compare the derived clause and account for every changed role.

Step 2: Ask what the extension adds or suppresses

Operation	Typical valency effect	Participant remapping
causative	increases	adds a causer; original subject becomes causee
applicative	increases	promotes beneficiary, goal, place, instrument, or reason to object
reciprocal	decreases/saturates an object relation	plural participants act on one another
stative	decreases	patient becomes subject; agent is absent; state or potential is foregrounded
passive	decreases core valency	object becomes subject; agent is omitted or demoted to a na phrase

These are diagnostics, not blind guarantees. Lexicalized verbs may have conventional argument structures, and extension stacks must be interpreted in their attested order.

Causative: add a causer

Start with intransitive lala:

Mtoto alilala mapema baada ya safari ndefu.

The child slept early after the long journey.

Its only core participant is the sleeper, mtoto. In the causative, a new causer becomes subject and the original sleeper becomes causee object:

Mama alimlaza mtoto mapema kwa sababu alikuwa amechoka.

Mother put the child to bed early because he was tired.

The established causative alternation is lala → laza. Map: Mama = causer subject; mtoto = causee object, indexed by -m-. This is not merely “sleep intensely”; it introduces a participant. See causative argument structure.

With a transitive base, causativization may produce two object-like participants, and animacy plus discourse status affects which one is object-marked. Do not infer their roles from surface order alone.

Applicative: promote a peripheral participant

Return to andika. A beneficiary would otherwise appear in a peripheral phrase such as kwa niaba ya mwenyekiti “on behalf of the chairperson.” Applicative andikia makes a recipient or beneficiary a core object:

Katibu alimwandikia mwenyekiti barua ya kuomba msamaha.

The secretary wrote the chairperson a letter of apology.

Build: a-li-mw-andik-i-a. Mwenyekiti is the applied human object and attracts -mw-; barua remains the theme. The extension raises valency from two participants to three.

Katibu alimwandikia mwenyekiti barua hiyo kwa kalamu nyeusi.

The secretary wrote that letter for the chairperson with a black pen.

Do not count every noun phrase as an object. Kwa kalamu nyeusi is an oblique instrument because it retains the preposition; mwenyekiti and barua hiyo are the two postverbal core objects. See applicative double objects.

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Object marking is evidence, not the entire diagnosis. A human applied object commonly attracts a marker, but definiteness, animacy, information structure, and the competing object all matter.

Reciprocal: bind participants into one relation

Underived saidia is transitive:

Neema alimsaidia Baraka kubeba mizigo.

Neema helped Baraka carry the luggage.

Neema is helper subject; Baraka is helped object. Reciprocal saidiana packages both directions into a plural subject:

Neema na Baraka walisaidiana kubeba mizigo mpaka nyumbani.

Neema and Baraka helped each other carry the luggage home.

There is no separate direct object meaning “each other”; reciprocal -an- saturates that relation. The infinitive kubeba mizigo is the activity in which they cooperate. A remaining noun can still belong to another role, so the mere presence of a postverbal noun does not disprove reciprocality.

Stative: make the affected entity the subject

With transitive vunja, an agent acts on a patient:

Mpishi alivunja kikombe alipokuwa akisafisha meza.

The cook broke the cup while clearing the table.

Stative vunjika removes the agent from the core map and presents the cup as undergoing or being in the resulting state:

Kikombe kilivunjika kilipoanguka kutoka mezani.

The cup broke when it fell from the table.

Map: kikombe = patient subject; no agent object and normally no na agent phrase. Depending on the verb and context, the stative can also express potential or ease. The stative versus passive contrast is crucial here.

Passive: promote an object and demote the agent

Passive preserves an event with an implicit or expressible agent:

Kikombe kilivunjwa na mpishi wakati wa usafi.

The cup was broken by the cook during cleaning.

The patient kikombe is subject and controls class 7 ki- agreement. The agent mpishi is optional and, when stated, appears in the oblique na phrase. Contrast this with stative kilivunjika, which presents the breaking without profiling an external agent.

That contrast matters semantically. English “the cup was broken” can describe either a passive event or a state; Swahili morphology makes the choice more explicit.

Step 3: Read a stack from the root outward

An applicative followed by passive shows why extension order and valency must be analyzed together:

Mwenyekiti aliandikiwa barua ya kuomba msamaha na katibu.

The chairperson was written a letter of apology by the secretary.

Build: a-li-andik-i-w-a. First applicative -i- adds mwenyekiti as recipient object. Then passive -w- promotes that applied object to subject. The original writer is demoted to na katibu, while barua remains a second object/theme.

Watoto walipikiana chakula kambini, lakini leo watapikiwa na mlezi.

The children cooked food for one another at camp, but today it will be cooked for them by the supervisor.

In walipikiana, applicative adds the beneficiary relation and reciprocal shares it across the plural subject: pik-i-an-a. In watapikiwa, applicative precedes passive: wa-ta-pik-i-w-a. The children are beneficiary subject, while the agent is the na phrase. See canonical extension order.

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For a stack, apply each operation successively: lexical root → inner extension → next extension. After every step, redraw the participant map instead of assigning one English translation to the whole suffix string.

A practical seven-question diagnostic

What is the dictionary form and established meaning of the whole verb?
What participants does the underived or inner lexical base license?
Which noun controls subject agreement?
Is there an object marker, and which noun does it index?
Which postverbal noun phrases lack prepositions and behave as objects?
Which participants are oblique, marked by na, kwa, or a locative construction?
Does the derived meaning follow a productive operation, or must the whole stem be learned lexically?

This final question prevents elegant but false analyses. A possible-looking suffix sequence may be lexicalized or unattested; lexicalization is part of valency analysis, not an exception to it.

Common Mistakes

Treating an object marker as a suffixal extension

❌ Katika alimwandikia, -mw- ni kiambishi tamati cha kutendea.

Incorrect analysis — -mw- is the pre-root human object marker, not the post-root applicative.

✅ Katika alimwandikia, -mw- hutaja mpokeaji na -i- ni kiambishi cha kutendea.

In alimwandikia, -mw- indexes the recipient and -i- is the applicative extension.

Giving a stative an agent phrase

❌ Kikombe kilivunjika na mpishi jana.

Incorrect for an intentional agent — stative vunjika does not normally license a by-agent phrase.

✅ Kikombe kilivunjwa na mpishi jana wakati wa usafi.

The cup was broken by the cook yesterday during cleaning.

Assuming every postverbal noun is an object

❌ Katika aliandika kwa kalamu, kalamu ni yambwa ya pili.

Incorrect analysis — kwa marks kalamu as an oblique instrument.

✅ Aliandika barua kwa kalamu mpya aliyozawadiwa.

She wrote the letter with a new pen that she had been given.

Coining a stack because the valency arithmetic works

❌ Tukiongeza viambishi kwa mpangilio, kila kitenzi kinachotokea lazima kiwe sahihi.

Incorrect claim — morphological order alone does not make every coined verb established Swahili.

✅ Tunakagua maana na matumizi ya kitenzi kizima kabla ya kukitumia.

We check the meaning and usage of the whole verb before using it.

Key Takeaways

Map the base predicate before analyzing the derived one.
Causative and applicative typically add core participants.
Reciprocal, stative, and passive reduce or reorganize core relations in different ways.
Subject agreement, object marking, bare noun phrases, and oblique marking provide complementary evidence.
Read stacks inside out, redrawing valency after each extension and checking the complete verb's established usage.

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