Wanapoenda sokoni, hununua papai na zabibu kwa ajili ya watoto.

It can be broken down like this:

• wa- = they
• -na- = present/imperfective marker
• -po- = a relative marker here giving the sense of when/as
• -enda = go

So wanapoenda means something like when they go or as they go.

Because the sentence needs a time clause, not just a simple statement.

• wanaenda = they are going / they go
• wanapoenda = when they go / as they go

The -po- changes the verb so it works like when in English. That is why wanapoenda sokoni means when they go to the market, not just they go to the market.

hu- is a marker often used for habitual or customary action.

So:

• hununua = (they) usually buy / habitually buy
• wananunua = more like they are buying or sometimes they buy, depending on context

In this sentence, hununua makes the action sound like a regular pattern: whenever they go, they buy these things.

Also, hu- verbs normally do not show the subject on the verb itself. The subject is understood from the earlier clause: wa- in wanapoenda already tells us we are talking about they.

In Swahili, subject information is usually built into the verb, so a separate pronoun is often unnecessary.

Here:

• wa- in wanapoenda already means they
• In the second clause, the subject is understood to be the same group

You would use wao only if you wanted extra emphasis or contrast, such as they, specifically, not someone else.

The ending -ni is a locative ending. It often gives meanings like:

• in
• at
• to

So:

• soko = market
• sokoni = at/in/to the market

With the verb kwenda (to go), English usually translates it as to the market.

kwa ajili ya is a common expression meaning:

• for
• for the sake of
• on behalf of

So kwa ajili ya watoto means for the children.

It is best learned as a whole phrase, because it functions like one unit in the sentence.

This is a very common learner question.

In kwa ajili ya watoto, the connector ya agrees with ajili, not with watoto.

• ajili belongs to a noun class that takes ya
• so the phrase is ajili ya watoto

Even though watoto refers to people, the agreement here is controlled by ajili, not by watoto.

No. Swahili normally does not use articles like the or a/an.

So nouns such as:

• sokoni
• papai
• zabibu
• watoto

do not need separate words for the or a/an. The exact meaning is understood from context.

The singular is mtoto.

So:

• mtoto = child
• watoto = children

This is part of the common human noun pattern in Swahili:

• singular often begins with m-
• plural often begins with wa-

That is why you will often see human-related agreement with wa- in other sentences too.

The basic order here is very natural:

• Wanapoenda sokoni = time clause
• hununua papai na zabibu = main action
• kwa ajili ya watoto = purpose/beneficiary phrase

Swahili word order is fairly flexible compared with English, but this version is clear and idiomatic. A learner should treat this order as the safest normal pattern.