Kwenye bango la darasa, tuliandika “Karibu!” kwa alama ya mshangao.

Kwenye is a very common locative word in Swahili. Depending on context, it can mean in, on, or at.

Here, kwenye bango means on the poster/sign. English makes a sharper distinction between on, in, and at, but Swahili often uses one locative expression where English would choose among several prepositions.

Because the connector -a must agree with the first noun, not the second one.

The head noun here is bango (poster/sign), and bango belongs to noun class 5 in the singular. Class 5 uses la, so:

bango la darasa = the class/classroom poster

If the head noun were from a different noun class, the connector would change.

Tuliandika can be divided like this:

• tu- = we
• -li- = past tense marker
• -andika = write

So tuliandika means we wrote.

This is a very common Swahili verb pattern:
subject marker + tense marker + verb root

Because it is the exact word that was written on the poster.

In this sentence, Karibu! is not just being mentioned as vocabulary; it is the actual text written on the sign. On signs, Karibu! commonly means Welcome!

So the sentence is talking about writing that exact word.

Here, Karibu! means Welcome!

The word karibu can have several related uses in Swahili, such as near, welcome, or you’re welcome, depending on context. In this sentence, because it appears as a message on a poster, the intended meaning is the sign-like use: Welcome!

Here kwa means something like with, by means of, or using.

So:

kwa alama ya mshangao = with an exclamation mark / using an exclamation mark

This is a very common use of kwa in Swahili: it can introduce the means, manner, or instrument used to do something.

Because alama means mark or sign, and mshangao means surprise or exclamation in this context.

So:

alama ya mshangao = literally mark of exclamation
= exclamation mark

The connector is ya because alama belongs to a noun class that takes ya with -a connectors.

Not only that. Mshangao comes from the idea of surprise or astonishment. Depending on context, it can mean surprise in a general sense.

But in punctuation terminology, alama ya mshangao is the normal expression for exclamation mark. So in this sentence, that is the meaning you should understand.

Swahili often allows flexible word order, especially with phrases that set the scene.

By putting Kwenye bango la darasa first, the speaker is highlighting the location first, almost like:

On the classroom poster, we wrote ...

You could also express the idea with the main clause first, but this version naturally foregrounds where the writing appeared.

Sometimes yes, but the nuance is a little different.

• kwenye bango is a very natural general way to say something is on/in/at the poster
• juu ya bango emphasizes being on top of or on the surface of the poster

For writing that appears on a poster, kwenye bango sounds very normal and idiomatic.

The comma marks a pause after the introductory location phrase.

So the sentence is structured like this:

Kwenye bango la darasa, = setting the scene
tuliandika Karibu! kwa alama ya mshangao. = main statement

This works much like English when you begin with a phrase such as On the classroom poster, ...

Tuliandika is the straightforward past tense: we wrote.

Tukaandika often has a more sequential or narrative feel, something like and then we wrote or so we wrote.

In this sentence, the speaker is simply stating what was written, so tuliandika is the neutral and expected choice.