Explain to me what the difference between "wash with soap," and "bathe with soap is," in this context, please. Idiomatically, no native English speaker says "bathe with soap," unless they're on stage! Please trust us to tell the difference between thr two verbs using the context of the sentence.
Commands using regular verbs (which generally end in -a) when indicating a single recipient will take the normal verb form, but commands indicating multiple recipients take the -eni suffix, which is added after removing the final vowel ‐a.
Example with "soma" = read/study:
(to one person) "Soma!"
(to several people) "Someni!"
This explanation is from lesson 43 Imperatives in the extensive study notes on Swahili from the University of Kansas: