Watoto wanaocheza mpira uwanjani wanafurahi.

A helpful breakdown is:

• Watoto = children
• wanaocheza = who are playing
• mpira = ball / football
• uwanjani = in the field / on the playground
• wanafurahi = are happy

So the structure is basically:

Watoto + wanaocheza mpira uwanjani + wanafurahi
= The children who are playing ball in the field are happy

The part wanaocheza mpira uwanjani describes which children we mean.

Watoto is the plural of mtoto (child).

This is part of the Swahili noun class system:

• mtoto = child (singular)
• watoto = children (plural)

This class often uses:

• singular: m-
• plural: wa-

So:

• m-toto → wa-toto

Because watoto is plural and refers to people, the verbs that go with it also use plural agreement for this noun class.

Wanaocheza is made of several pieces:

• wa- = they / subject agreement for children
• -na- = present / ongoing action
• -o- = relative marker, meaning something like who
• cheza = play

So wanaocheza literally works like:

they-are-who-play

In natural English, that becomes:

who are playing

This is very typical in Swahili: a lot of grammatical information gets packed into one verb word.

Because Swahili verbs usually combine several parts into a single word.

In English, we write:

• who are playing

In Swahili, those ideas are built into one verbal form:

• wanaocheza

Swahili commonly attaches:

• subject markers
• tense markers
• relative markers
• verb roots

all together. So what looks like a whole phrase in English may be just one word in Swahili.

Because both verbs must agree with watoto (children).

• wanaocheza = they who are playing
• wanafurahi = they are happy

The wa- part shows that the subject is plural people, matching watoto.

This can feel repetitive to an English speaker, but it is normal in Swahili. Each verb usually shows its own agreement with the subject.

The -o- is the relative marker here. It connects the verb to the noun it describes.

So wanaocheza means:

• who are playing

Without that relative idea, you would just have a normal verb meaning they are playing.

The -o- is what gives the sense of who, as in:

• watoto wanaocheza = the children who are playing

It helps form a relative clause.

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

So:

• watoto can mean children or the children
• mpira can mean a ball, the ball, or just ball

The exact meaning depends on context.

In this sentence, English usually translates watoto as the children because the relative clause wanaocheza mpira uwanjani identifies a specific group of children.

Uwanjani comes from uwanja, which means field, ground, yard, or playground depending on context.

The ending -ni is a locative ending, often meaning:

• in
• at
• on

So:

• uwanja = field / playground
• uwanjani = in the field / at the playground / on the field

This -ni ending is very common in Swahili for places.

Mpira basically means ball, but in everyday use it can also refer to ball games, especially football/soccer, depending on context.

So kucheza mpira can mean:

• to play ball
• to play football/soccer

In this sentence, the exact translation depends on context. If nothing else is specified, playing ball is a safe general translation.

The sentence is structured like this:

• Watoto wanaocheza mpira uwanjani = the full subject noun phrase
• wanafurahi = the main predicate

So the relative clause is:

• wanaocheza mpira uwanjani = who are playing ball in the field

And the main statement is:

• wanafurahi = are happy

A useful way to see it is:

[The children who are playing ball in the field] [are happy].

Yes. That is a very natural English translation.

English can say either:

• The children who are playing ball in the field are happy
• The children playing ball in the field are happy

Both match the Swahili sentence well.

The first is more explicit.
The second is more compact.

The given order is very natural:

Watoto wanaocheza mpira uwanjani wanafurahi.

Swahili word order is often fairly flexible, but not totally free. In this sentence, the most straightforward pattern is:

• noun
• relative clause
• main verb

You may sometimes move elements like uwanjani for emphasis, but for a learner, it is best to keep the basic order as written until you are comfortable with the structure.

In Swahili, ideas that English often expresses with to be + adjective can be expressed with a verb-like form.

So:

• wanafurahi literally contains verb morphology
• but in natural English it means they are happy

It breaks down as:

• wa- = they
• -na- = present
• furahi = be happy / rejoice / be glad

So even though English uses are happy, Swahili expresses it as a full verbal form.

The dictionary forms are:

• kucheza = to play
• kufurahi = to be happy / to rejoice / to enjoy oneself

In Swahili, dictionary verb forms usually begin with ku-, which is the infinitive marker.

So:

• cheza is the verb stem
• kucheza is the full infinitive

and:

• furahi is the verb stem
• kufurahi is the full infinitive