Darasani leo, mwalimu alitumia chaki nyeupe kuandika hesabu kwenye ubao.

The ending -ni is a very common locative ending in Swahili. It often adds the idea of in, at, to, or on a place.

• darasa = classroom / class
• darasani = in the classroom

You will see this with many place words:

• nyumba = house
• nyumbani = at home / in the house

So darasani leo means something like in the classroom today.

Yes, that is normal. Swahili is often more flexible than English about word order, especially with time and place expressions.

Starting with Darasani leo puts the setting first:

• Darasani leo, mwalimu alitumia...
• literally: In the classroom today, the teacher used...

This feels natural in Swahili, especially when you want to set the scene first. English can do this too, but Swahili does it very comfortably.

Alitumia can be broken down like this:

• a- = he/she
• -li- = past tense
• -tumia = use

So:

• alitumia = he/she used

This is a very useful Swahili pattern:

• anasoma = he/she is reading
• alisoma = he/she read
• atatumia = he/she will use

The verb itself carries a lot of information.

Because Swahili usually includes the subject inside the verb.

In alitumia, the a- already means he/she. So Swahili often does not need a separate subject pronoun like English does.

That means:

• Mwalimu alitumia... = The teacher used...
• You do not need to say a separate word for he or she

If you added a pronoun, it would usually be for emphasis, not because grammar requires it.

Mwalimu is not inherently male. It can mean teacher for either a man or a woman.

Swahili usually does not mark gender the way English sometimes does. The verb prefix a- also means he or she, depending on context.

So mwalimu alitumia could refer to:

• a male teacher, or
• a female teacher

You know which one from the situation, not from the grammar alone.

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

So:

• chaki nyeupe = white chalk
• literally: chalk white

This is the normal pattern in Swahili:

• kitabu kikubwa = big book
• gari jipya = new car
• mtoto mdogo = small child

So noun + adjective is the standard order.

Yes. In Swahili, adjectives usually agree with the noun class of the noun they describe.

Chaki belongs to the N-class, and the adjective -eupe becomes nyeupe with that class.

So:

• chaki nyeupe = white chalk

Compare with other noun classes:

• kitabu cheupe = white book
• vitabu vyeupe = white books
• mti mweupe = white tree

So the adjective changes form depending on the noun class. That agreement is a major feature of Swahili grammar.

Here kuandika means to write, and it shows purpose.

So:

• alitumia chaki nyeupe kuandika hesabu
• literally: he/she used white chalk to write arithmetic

In Swahili, the ku- form is the infinitive, like English to write, to read, to go.

Examples:

• alikuja kusoma = he/she came to study
• walitumia pesa kununua chakula = they used money to buy food

So kuandika explains what the chalk was used for.

Hesabu can mean things like:

• arithmetic
• mathematics
• sums / calculations

In this sentence, it most likely means math work, arithmetic, or some sums written on the board.

Like many Swahili nouns, it does not have to work exactly like a countable English noun. Context tells you whether it means:

• the subject of math in general, or
• particular calculations or problems

Here it likely means the teacher wrote math work or some calculations.

Kwenye is a very common location word that can mean on, in, at, or onto, depending on context.

Here:

• kwenye ubao = on the board

With writing, kwenye is very natural. It marks the place where the writing appears.

You can think of it as a practical, everyday locative word. It does not always match one single English preposition.

Good question. These expressions overlap a bit, but they are not identical.

• kwenye ubao = on/at the board; very natural and idiomatic here
• katika ubao = inside the board, which does not fit this context
• juu ya ubao = on top of the board; this can sound more physically literal

When talking about writing on a board, kwenye ubao is the natural choice.

So even though English says on the board, Swahili often uses kwenye rather than something more literal.

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

So:

• mwalimu can mean a teacher or the teacher
• ubao can mean a board or the board

You understand which one is meant from context.

This is very common in Swahili. Learners often want to insert the or a, but Swahili simply does not require them.

Yes. Leo is quite flexible.

You can say:

• Darasani leo, mwalimu alitumia...
• Leo, mwalimu alitumia...
• Mwalimu alitumia chaki nyeupe leo...

The meaning stays very similar, but the emphasis changes a little.

• Darasani leo puts the setting first
• Leo first emphasizes the time
• putting leo later can sound a bit more neutral

So the sentence you were given is natural, but not the only possible word order.