Kesho watanunua mabati na nondo kwa ajili ya paa jipya.

In Swahili, the subject is often built into the verb itself.

Here, watanunua breaks down like this:

• wa- = they
• -ta- = future tense marker, will
• -nunua = buy

So watanunua already means they will buy.

Because of that, Swahili usually does not need a separate standalone pronoun unless you want extra emphasis.

-ta- is the future tense marker in Swahili.

So:

• wananunua = they are buying / they buy
• watanunua = they will buy

In this sentence, wa-ta-nunua means they will buy.

Kesho means tomorrow.

It gives the time of the action. Even though the verb already has future tense (-ta-), adding kesho makes the timing more specific.

So the sentence has both:

• grammatical future: watanunua = they will buy
• time word: kesho = tomorrow

This is very normal in Swahili.

Yes. Swahili word order is somewhat flexible, especially with time expressions.

For example, these are possible:

• Kesho watanunua mabati na nondo kwa ajili ya paa jipya.
• Watanunua mabati na nondo kesho kwa ajili ya paa jipya.

Starting with kesho is very natural because it sets the time right away.

Mabati usually refers to corrugated metal sheets, especially the kind used for roofing.

In many contexts, English translations include things like:

• roofing sheets
• metal sheets
• iron sheets

It is a very common construction-related word in East African Swahili.

Mabati is the plural form.

Swahili nouns belong to noun classes, and many nouns in this pattern use:

• singular: often ji- or no obvious prefix
• plural: ma-

So mabati refers to multiple sheets.

In everyday usage, learners often just memorize bati / mabati as a pair.

Nondo usually means metal rods or reinforcing rods, often called rebar in construction English.

So mabati na nondo means something like:

• roofing sheets and metal rods
• corrugated sheets and rebar

The exact English wording depends on context, but it clearly refers to building materials.

Kwa ajili ya means for, for the sake of, or for the purpose of.

In this sentence:

• kwa ajili ya paa jipya = for the new roof

It shows the purpose of buying the materials.

This expression is very common in Swahili when explaining what something is intended for.

Sometimes kwa by itself can mean for, but kwa ajili ya is more explicit and often sounds clearer when talking about purpose.

Compare the idea:

• kwa = for / by / with / at, depending on context
• kwa ajili ya = specifically for the purpose of

So in this sentence, kwa ajili ya makes the intended use of the materials very clear.

This is because adjectives in Swahili must agree with the noun class of the noun they describe.

Paa belongs to the noun class that takes the adjective agreement prefix ji- in the singular.

The adjective stem is -pya = new.

So:

• paa jipya = new roof

If the noun were in a different noun class, the adjective form would change. For example:

• mtoto mpya = new child
• jina jipya = new name
• nyumba mpya = new house

So jipya is correct because it matches paa.

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

So:

• paa jipya = roof new = new roof

This is the normal pattern in Swahili.

Some more examples:

• kitabu kikubwa = big book
• nyumba nzuri = nice house
• gari jipya = new car

Because jipya comes right after paa, and in Swahili adjectives normally follow the noun they modify.

So the structure is:

• kwa ajili ya paa jipya
• for [a new roof]

If the speaker wanted to say new metal sheets instead, the adjective would need to agree with mabati, not paa.

So in this sentence, only the roof is described as new.

Yes. Na here simply means and.

So:

• mabati na nondo = metal sheets and rods

Very straightforward.

Be aware that na can also have other uses in Swahili in different contexts, such as with or as part of certain verb constructions, but here it is just the coordinator and.

No. Swahili usually does not use articles like English a, an, or the.

So paa jipya can mean:

• a new roof
• the new roof

The exact interpretation depends on context.

That is why Swahili learners often have to rely on the situation, previous conversation, or translation choices.

No, not from this sentence alone.

Wa- tells us the subject is they, but it does not identify exactly who those people are. The listener is expected to know from context.

For example, they could be:

• the builders
• the family
• the workers
• the neighbors

Swahili often leaves this kind of information understood rather than repeated.

Yes:

• Kesho = tomorrow
• wata-nunua = they-will-buy
• mabati = metal sheets / roofing sheets
• na = and
• nondo = metal rods / rebar
• kwa ajili ya = for / for the purpose of
• paa jipya = new roof

So the structure is:

Tomorrow + they will buy + metal sheets and rods + for a new roof

That breakdown is very helpful for seeing how Swahili builds meaning piece by piece.