Kazi ilianza mnamo mwaka huu.

Because the subject is kazi, and the verb has to agree with that noun class.

Kazi belongs to the N class in Swahili. With this noun, the subject marker on the verb is i- in the singular sense used here. So:

• kazi ilianza = the work started

If the subject were a different noun class, the verb prefix would change:

• mtu alianza = the person started
• mradi ulianza = the project started

So i- is there because of kazi.

It can be broken down like this:

• i- = subject marker for kazi
• -li- = past tense marker
• -anza = verb root meaning begin / start

So:

• i-li-anza = it started / it began

This is a very useful pattern in Swahili, because many verbs are built the same way: subject marker + tense marker + verb root.

Mnamo is a preposition used mainly with time expressions, especially dates, years, and periods of time. Here it means something like:

• in
• during

So mnamo mwaka huu means in this year or more naturally this year.

It is a somewhat formal or careful word, and you will often see it in writing or more formal speech.

No, not always.

You can also say:

• Kazi ilianza mwaka huu.

That is very natural and common. In many everyday contexts, Swahili does not need an extra word for in before time expressions.

So:

• Kazi ilianza mnamo mwaka huu = correct, a bit more formal
• Kazi ilianza mwaka huu = also correct, very natural

In Swahili, words like this, that, and adjectives usually come after the noun, not before it.

So:

• mwaka huu = this year
• mtu huyu = this person
• kitabu hiki = this book

This is different from English, where this comes before the noun.

Also, huu agrees with mwaka in noun class, so it is not just position that matters; it is also an agreement form.

Because mwaka belongs to a noun class that takes the demonstrative form huu for this.

In Swahili, this changes depending on the noun class:

• mwaka huu = this year
• mtoto huyu = this child
• kitabu hiki = this book

So English has one form, this, but Swahili has several forms that must match the noun.

Kazi is a broad word. Depending on context, it can mean:

• work
• job
• task
• assignment
• sometimes even function or purpose

In this sentence, the most natural meaning is probably work or the work. But if the wider context is about employment, a project, or a specific assignment, the exact English translation might change.

So the Swahili word is flexible, and context tells you which English word fits best.

Here it is being treated as singular, or as a mass noun like work in English.

One tricky thing about kazi is that its form does not change between singular and plural. The noun itself stays kazi, but the verb agreement helps show the difference:

• kazi ilianza = the work started / the job started
• kazi zilianza = the works/tasks/jobs started

So the i- in ilianza shows that the sentence is using singular-type agreement here.

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

That means a noun like kazi can mean:

• work
• the work
• a job
• the job

The exact meaning depends on context.

So in this sentence, English may need the, but Swahili does not use a separate word for it.

In this sentence, ilianza is a past tense form, so started or began is the best match.

If you wanted has started in the sense of a completed action with present relevance, Swahili would more naturally use imeanza:

• Kazi ilianza mwaka huu = The work started this year
• Kazi imeanza = The work has started

So -li- is the normal past marker, while -me- often gives a present-perfect-type meaning.

Yes, a little.

The original order is very normal:

• Kazi ilianza mnamo mwaka huu.

But you can move the time expression to the front for emphasis:

• Mnamo mwaka huu, kazi ilianza.

You can also omit mnamo:

• Mwaka huu, kazi ilianza.

All of these are possible, though the original version sounds orderly and natural. What you generally cannot do is put the demonstrative before the noun in an English-like way, so huu mwaka is not the normal pattern here.

Yes, it can look strange to an English speaker because it begins with mn-.

It is pronounced roughly as m-na-mo, with the m and n both heard. Try saying it smoothly as one word, not as two separate parts.

A helpful approach is:

• start with a light m
• move straight into na
• then finish with mo

So do not drop the first consonant. Swahili often allows consonant combinations that feel unusual at first to English speakers.