Kufuga kuku wengi kunahitaji banda kubwa.

Because kufuga is an infinitive, built from ku- + fuga.

• fuga = raise, keep, or rear domesticated animals
• kufuga = to raise / raising

In Swahili, an infinitive can act like a noun. So kufuga kuku wengi means something like raising many chickens or keeping many chickens. That whole phrase becomes the subject of the sentence.

The subject of the sentence is kufuga kuku wengi, and that subject is headed by the infinitive kufuga. Infinitives are treated as noun class 15, whose subject marker is ku-.

So:

• ku- = subject marker agreeing with the infinitive phrase
• -nahitaji = needs / requires

So kunahitaji literally means it requires, where it refers to raising many chickens.

It breaks down like this:

• Kufuga kuku wengi = raising many chickens
• kunahitaji = requires
• banda kubwa = a big coop / a large shed

So the pattern is:

[subject phrase] + [verb] + [object]

That is very natural Swahili word order here.

Some Swahili nouns have the same form in both singular and plural, and kuku is one of them.

So:

• kuku can mean chicken
• kuku can also mean chickens

The context tells you which one is meant. In this sentence, wengi clearly shows it is plural: many chickens.

Because kuku refers to animals, and animate nouns often take the same agreement pattern as people in some modifiers.

So even though kuku belongs to the N-class in form, for many the natural form is:

• wengi = many, used with animate plural nouns

That is why kuku wengi means many chickens.

A learner often expects nyingi because of noun class patterns, but with animals and other animate nouns, wengi is very common and natural.

Not exactly.

• fuga is used for keeping, rearing, or domesticating animals
• lea is more general and often means raise, as in raising a child, or sometimes nurturing something

So for chickens, kufuga kuku is the normal choice: to keep/rear chickens.

In Swahili, adjectives normally come after the noun they describe.

So:

• banda kubwa = big/large coop
• not kubwa banda

This is the normal noun + adjective order in Swahili.

Kubwa is the correct agreeing form with banda here.

• banda is a singular noun in class 5
• the adjective stem is -kubwa = big / large
• with banda, the correct form is kubwa

So:

• banda kubwa = a large coop
• plural: mabanda makubwa = large coops

That contrast helps show the agreement more clearly.

Not always. Banda is a general word for a shelter, shed, pen, or enclosure. In this sentence, because we are talking about chickens, banda kubwa is naturally understood as a large coop or a large chicken shelter.

So the exact English word depends on context.

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

So banda kubwa can mean:

• a large coop
• the large coop
• sometimes just large coop

The context decides which English article is best when translating.

Yes. That is a very close, literal way to understand it.

Natural English translations include:

• Raising many chickens requires a large coop.
• Keeping many chickens requires a large coop.
• To keep many chickens, you need a large coop.

The Swahili structure is centered on kufuga as a verbal noun, so keeping/raising many chickens is the core idea.