Causative Extension (-ish-/-esh-/-z-) in Swahili

Overview

The causative extension means "cause to do" or "make someone do." At the CEFR B2 level, learning this highly productive extension reveals how many common Swahili verbs are actually causative forms of simpler roots. "Fundisha" (teach) is the causative of "funza" (learn/be taught), meaning literally "cause to learn."

The causative is formed by adding -ish-/-esh- (with vowel harmony) or -z- before the final vowel. Some causatives have become lexicalized as independent vocabulary items that learners encounter long before studying the extension formally.

How It Works

Formation

Pattern	Base Verb	Causative	Meaning
-ish-	pika (cook)	pikisha	cause to cook / have cooked
-esh-	enda (go)	endesha	drive (cause to go)
-z-	ogopa (fear)	ogopesha/ogofya	frighten
-ish-	lala (sleep)	lalisha	put to sleep
-ish-	soma (read)	somesha	cause to read/teach
-esh-	rudi (return)	rudisha	return (something)

Common Lexicalized Causatives

Causative	Literal meaning	Common meaning
fundisha	cause to learn	teach
endesha	cause to go	drive
rudisha	cause to return	return (give back)
amsha	cause to wake	wake someone up
kausha	cause to dry	dry (something)
ongeza	cause to increase	add/increase

Examples in Context

Swahili	English	Note
Mwalimu anawafundisha watoto.	The teacher teaches the children.	Lexicalized causative
Alimpikisha kazi.	He made her cook.	Forced action
Ninaendesha gari.	I am driving a car.	Causative of -enda
Mama alimlalisha mtoto.	Mother put the child to sleep.	Care context
Rudisha kitabu changu.	Return my book.	Causative of -rudi
Amsha watoto!	Wake the children!	Causative of -amka
Ananisomesha Kiswahili.	He is teaching me Swahili.	Alternative to -fundisha
Jua linakausha nguo.	The sun dries the clothes.	Natural causation
Ameongeza bei.	He has increased the price.	Causative of -ongezeka
Nimemrudisha nyumbani.	I have returned him home.	With object infix

Common Mistakes

Not recognizing lexicalized causatives

• Wrong: Treating "fundisha" as a basic verb unrelated to "funza"
• Right: Recognizing that fundisha = funza + causative -ish-
• Why: Understanding the derivation helps predict meaning and connect vocabulary.

Using double causative unnecessarily

• Wrong: fundishisha (cause to cause to learn)
• Right: fundisha (teach) is sufficient
• Why: Most verbs need only one causative extension.

Usage Notes

The causative is one of the most productive extensions. Many everyday verbs that learners memorize as vocabulary items are actually causative forms. Recognizing this pattern dramatically accelerates vocabulary acquisition.

Some verbs have irregular causative forms: -ua (kill) from -fa (die), -nywesha (water/give drink) from -nywa (drink).

Practice Tips

1. Vocabulary archaeology: Take ten common verbs and identify which are causative forms of simpler roots.
2. Causative sentence pairs: Write "X does Y" then "Z causes X to do Y": "Mtoto analala" → "Mama anamlalisha mtoto."
3. Extension stacking: Practice combining causative with other extensions: fundisha + passive = fundishwa.

Related Concepts

• Prerequisite: Applied/Prepositional Extension (-i-/-e-/-li-/-le-) — the applied form as first extension learned
• Next steps: Combined Verb Extensions — stacking multiple extensions