Alifanya kazi kwa hiari.

Alifanya can be divided like this:

• a- = he/she
• -li- = past tense marker
• -fanya = do / make

So alifanya literally means he/she did.

In this sentence, it combines with kazi to give the idea he/she worked or literally he/she did work.

Yes, -fanya means do/make, but in Swahili, kufanya kazi is the normal expression for to work.

So:

• kufanya = to do
• kazi = work
• kufanya kazi = to work

This is very common and natural in Swahili. It works much like expressions in English where a verb and noun go together to express one idea.

It can mean either he or she.

In Swahili, the subject prefix a- is used for third person singular and does not show gender. So:

• Alifanya kazi kwa hiari. can mean:
  • He worked voluntarily
  • She worked voluntarily

You need context to know which one is meant.

Kwa hiari means voluntarily, willingly, or of one’s own free will.

Breakdown:

• kwa = a very common word that often means by, with, in, or indicates manner
• hiari = choice, free will, consent

So kwa hiari literally suggests something like by free choice or of one’s own will.

Functionally, yes.

Even though it is made from more than one word, kwa hiari acts like an adverbial expression because it tells us how the person worked.

So in this sentence:

• Alifanya kazi = he/she worked
• kwa hiari = voluntarily / willingly

It answers the question How did he/she work?

Literally, it is closer to He/she did work voluntarily, because fanya kazi is literally do work.

But in natural English, the best translation is usually:

• He/she worked voluntarily
• or He/she did the work willingly, depending on context

So the literal structure and the natural meaning are slightly different.

Because Swahili usually puts the subject inside the verb.

In alifanya:

• a- already means he/she

So you do not need a separate subject pronoun unless you want emphasis or contrast.

For example:

• Yeye alifanya kazi kwa hiari. = He/She worked voluntarily.
  Here yeye adds emphasis, like he/she personally.

Swahili does not have articles like a, an, and the.

So kazi can mean:

• work
• a job
• the work

The exact meaning depends on context.

That is why Alifanya kazi kwa hiari can be understood naturally without any article.

The basic order here is:

• Verb: Alifanya
• Object / complement: kazi
• Adverbial phrase: kwa hiari

So the pattern is roughly:

Verb + Object + Adverbial phrase

That said, Swahili word order can be somewhat flexible, especially for emphasis, but this version is very normal and natural.

Sometimes it could be understood that way in context, but it is not the most direct way to say He/she volunteered.

Alifanya kazi kwa hiari more directly means:

• He/she worked voluntarily
• He/she did the work willingly
• He/she worked of his/her own free will

If you specifically mean served as a volunteer or did volunteer work, Swahili might use a different expression depending on context.

You can say:

Hakufanya kazi kwa hiari.

Breakdown:

• ha- = negative marker
• -ku- = negative past marker
• -fanya = do
• kazi = work
• kwa hiari = voluntarily

So it means:

• He/she did not work voluntarily
• He/she did not do the work willingly

You would say:

Walifanya kazi kwa hiari.

Breakdown:

• wa- = they
• -li- = past tense
• -fanya = do

So:

• Walifanya kazi kwa hiari. = They worked voluntarily.

Yes. Hiari is a useful word related to choice and free will.

For example, you may see:

• kwa hiari yangu = of my own free will
• kwa hiari yake = of his/her own free will
• bila hiari = involuntarily / unwillingly / unintentionally, depending on context

So hiari is not limited to this one sentence.

It is quite neutral and natural.

It would work in:

• everyday speech
• writing
• news or reporting
• general description

It is not especially slangy or especially formal. It is a standard, clear Swahili sentence.