Polite Subjunctive Request

The polite imperative is an essential everyday pattern in Swahili. It is significantly less face-threatening than a bare direct command, making it the socially expected way to make requests to elders, strangers, or customers. It is also used casually among peers to soften instructions.

How to form it:

• Bantu verbs: Attach the singular subject prefix u- or the plural subject prefix m- to the verb root, and change the final -a to -e (e.g., kaa → ukae; soma → usome). Note that m- becomes mw- before vowel-initial verb roots (e.g., enda → mwende).
• Suggestions (Let's...): Use the first-person plural prefix tu- to suggest an action for the group (e.g., tule, twende). When addressing a group of three or more (including the speaker), Swahili speakers frequently attach the plural imperative suffix -ni to the end of the verb (e.g., twendeni). Note that twendeni can be confusing for learners because it combines a first-person plural subject prefix (tu-) with a second-person plural imperative suffix (-ni). Because of this morphological clash, you will find conflicting interpretations: some resources teach it as "Let's go (3+ people)", while others interpret it as a second-person plural command ("You all go!").
• Object Prefixes: Adding an object prefix to a command forces native Bantu verbs ending in -a to take an -e ending. If you omit the subject prefix but include an object prefix (e.g., nisaidie "help me", mwambie "tell him/her"), standard Swahili grammars classify this technically as an imperative taking an -e ending, rather than a subjunctive with a dropped subject prefix. When addressing multiple people, you must add the plural suffix -ni to the end of the verb (e.g., nisaidieni "help me (you all)", mwambieni "tell him/her (you all)").
• Arabic loanwords: Verbs ending in -i, -u, or -e do not change their final vowel (e.g., jaribu → ujaribu). See borrowed verbs in the subjunctive.
• Monosyllabic and Irregular verbs: Drop the infinitive ku- prefix (e.g., kula → ule; kuja → uje). Additionally, the irregular bare imperatives njoo (come) and lete (bring) become completely regular in the polite subjunctive: uje and ulete.
• Negative commands: Insert -si- between the subject prefix and the verb root (e.g., usikae, msiende). Remember that native Bantu verbs still end in -e in the negative. For monosyllabic verbs, the ku- prefix remains dropped in the standard negative (e.g., usile, usije). You can also predictably combine negative commands with object prefixes (e.g., usimwambie "don't tell him/her"). However, when addressing multiple people in the negative, do not use the -ni suffix with object prefixes, because the plural subject prefix m- already indicates plural addressees (e.g., msinisaidie, not msinisaidieni). See negative commands.

Important Nuances:
English speakers often mistakenly use the present indicative (e.g., unakaa) to mean "you should sit." In Swahili, the indicative means "you are sitting" or "you sit" (a statement of fact or habit). You must use the subjunctive (ukae) for instructions.

Additionally, you do not need to use the word tafadhali (please) to make a command polite. The subjunctive form itself inherently carries the polite nuance; tafadhali just adds extra deference.