"You all will not prepare food"
Examples of causative verbs:
End vowels other than I are changed to I, the causative suffix SH is added, then the final ending vowel (-A in infinitive, -I or -E in constructions requiring them) is added to make the transition into verb complete.
safi || kusafisha to cleanse
haraka || kuharakisha to make (someone) hurry
rahisi || kurahisisha to simplify
tayari || kutayarisha to prepare, make ready, finish
hatari || kuhatarisha to endager
elimu || kuelimisha to educate
laini || kulainisha to soften
maana || kumaanisha to give meaning to
tafadhali || kutafadhalisha to beg (for assistance, e.g.)
aibu || kuaibisha to disgrace, shame
One word has a double causative treatment:
sawa || kusawazisha to equalize, compare
Kesho nitasafisha nywele. Tomorrow I will wash my hair.
Dereva huyu anahatarisha maisha ya watu. This driver endangers people's lives.
Unamaanisha nini kwa kusema "Kahawa kavu"? What do you mean by saying "Dry coffee"?
Tendo hili limeaibisha darasa zima. This act has disgraced the whole class.
From KamusiGOLD: https://www.kamusi.org/content/verb-derivation