ji-

The reflexive marker -ji- is a highly frequent and productive prefix in Swahili. It attaches directly before the verb stem, following the standard verb slot order.

Structure:
Conjugated: Subject Prefix + Tense Marker + -ji- + Verb Stem
Negative: Negative Subject Prefix + (Tense Marker) + -ji- + Verb Stem (Note: final vowel becomes -i in the present negative for native Bantu verbs ending in -a; borrowed verbs do not change their final vowel)
Infinitive: ku- + -ji- + Verb Stem
Habitual: hu- + -ji- + Verb Stem
Imperative: -ji- + Verb Root + -e / -eni
Subjunctive: Subject Prefix + -ji- + Verb Root + -e

Key Rules:

• Invariable: The prefix -ji- is completely invariable. It remains exactly the same whether the subject is 'I', 'you', 'they', or a noun class subject.
• Negation: The -ji- prefix remains completely unchanged in negative tenses (e.g., sijifunzi, I am not learning).
• Single Object Prefix Limit: Standard Swahili only allows one object prefix per verb. Because -ji- occupies the object slot, no other object prefix can be added. For example, you must say Nilijinunulia kitabu (I bought myself a book), not Nilikijinunulia.
• Monosyllabic Verbs: When used with short verbs, the infinitive ku- drops because the -ji- prefix provides enough syllables to carry the stress. For example, kupa (to give) becomes ninajipa (I give myself), not ninakujipa.
• Final Vowel Mutation: Because -ji- functions as an object prefix, it triggers the standard Bantu final-vowel mutation in the imperative (command) form. The final -a of a Bantu verb must change to -e when -ji- is present (e.g., Jifunze! "Learn!"). Note that borrowed verbs ending in -i, -u, or -e do not change their final vowel (e.g., Jiamini! "Believe in yourself!").
• Applicative Nuance: When combined with an applicative extension, it conveys doing an action "for oneself" or "by oneself" (e.g., kujipikia, to cook for oneself). It can also express doing an action aimlessly, casually, or without a specific purpose (e.g., kujiendea, to just walk along; kujikalia, to just sit around).
• Pretending: When used with certain verbs, especially causatives, -ji- can mean "to pretend to be" or "to act like" (e.g., kujifanya, to pretend; kujigonjwesha, to pretend to be sick).
• Emphasis: To add extra emphasis, you can use the word mwenyewe (myself/yourself/himself/herself) after the verb, as in Nilijipikia mwenyewe (I cooked for myself).
• False Reflexives: Be careful with verbs like kujibu (to answer), kujua (to know), or kujenga (to build). The -ji- in these verbs is part of the root itself, not the reflexive prefix.

Some verbs have lexicalized the -ji- prefix so deeply that it is part of their core meaning, such as kujifunza (to learn, lit. to teach oneself) and kujiamini (to be self-confident, lit. to trust oneself). It can also create psychological or idiomatic meaning shifts, such as kuona (to see) becoming kujiona (to be arrogant or full of oneself) and kusikia (to hear or feel) becoming kujisikia (to feel a certain way, often proud or unwell).

Before a Vowel:
Ji- keeps its i before a vowel-initial stem: kujiandaa (to prepare oneself), kujiona (to see oneself) and kujiamini (to believe in oneself). Keep the two vowel syllables where present; do not turn ji- into a j-/ch- prefix by analogy with noun-class alternations.