Mtu fulani alipiga simu jana usiku.

Fulani makes the noun indefinite and vague. In mtu fulani, it means something like some person, a certain person, or simply someone.

A few useful points:

• mtu = person
• mtu fulani = some person / a certain person / someone

It often suggests that the speaker either does not know exactly who the person is, does not want to say, or does not think the identity matters.

It comes after the noun, which is normal in Swahili for many modifiers.

In Swahili, modifiers usually come after the noun, not before it as in English.

So:

• mtu fulani = some person
• not fulani mtu

This is one of the basic word-order differences between English and Swahili. English often puts words like some before the noun, but Swahili commonly places descriptive or limiting words after it.

Yes. Mtu belongs to the m-wa human noun class:

• singular: mtu = person
• plural: watu = people

This matters because the verb agrees with the noun class of the subject. Since mtu is singular, the verb uses the singular human subject marker a-:

• mtu ... alipiga = the person ... called
• watu ... walipiga = the people ... called

So if you changed the subject to plural, the sentence would become:

Watu fulani walipiga simu jana usiku.

Because in Swahili, a finite verb normally needs a subject marker, even when the full subject noun is also present.

So in alipiga:

• a- = he/she (class 1 singular subject marker)
• -li- = past tense
• -piga = root

That means the verb itself already carries subject agreement. The noun mtu fulani is still stated, but the verb must still agree with it.

This is very normal in Swahili:

• Mtu fulani alipiga...
• literally something like A certain person he/she-called...

English does not do this, so it often feels unusual at first.

Alipiga can be broken down into three parts:

• a- = subject marker for he/she
• -li- = past tense marker
• -piga = verb stem

So:

a-li-piga = he/she hit / struck / called

In this sentence, because it is followed by simu, the meaning is the idiomatic one: made a phone call / called.

This pattern is very common in Swahili verb structure:

subject marker + tense marker + verb stem

For example:

• anapiga = he/she is calling
• atapiga = he/she will call
• walipiga = they called

Yes, piga often literally means hit, beat, or strike. But in many expressions it has idiomatic meanings.

One very common expression is:

• kupiga simu = to make a phone call / to call

So even though the literal parts may look strange to an English speaker, the whole expression functions as a normal unit.

This is similar to how English has expressions that are not fully literal, such as give someone a call. You are not really giving a call as a physical object; it is just the normal expression.

So it is best to learn kupiga simu as a set phrase.

It can refer to the phone as an object, but in the expression kupiga simu, the whole phrase means to call or to make a phone call.

So in this sentence, simu is part of the expression and the meaning is about the act of calling, not just the physical device.

Depending on context:

• simu = phone
• kupiga simu = to call by phone

Context tells you which sense is intended.

Swahili does not have articles that work like English a/an and the.

So mtu can mean:

• a person
• the person
• just person

The exact meaning depends on context.

In this sentence, fulani helps make it clear that the person is indefinite or unspecified, so mtu fulani naturally gives the sense of some person or someone.

Yes, literally it is something like yesterday night, but idiomatically it means last night.

Breakdown:

• jana = yesterday
• usiku = night

Together:

• jana usiku = last night

This is a natural Swahili time expression. English speakers often expect a structure closer to English, but Swahili commonly uses this kind of combination.

A related alternative is usiku wa jana, which also refers to last night or the night of yesterday, but jana usiku is a very common everyday way to say it.

The sentence as given is a very natural neutral order:

Mtu fulani alipiga simu jana usiku.

This follows a common pattern:

• Subject: Mtu fulani
• Verb: alipiga
• Object/complement: simu
• Time expression: jana usiku

But Swahili word order can be somewhat flexible, especially with time expressions. For example:

• Jana usiku, mtu fulani alipiga simu.

This is also correct and puts more focus on last night.

So the original order is not the only possible one, but it is a very normal default sentence order.

A natural way is:

Mtu fulani alinipigia simu jana usiku.

Here is what changed:

• a- = he/she
• -li- = past
• -ni- = me
• -pigia = call someone / do the calling toward someone

So alinipigia simu means called me.

This is useful because English speakers often want to know how to add the person being called. In Swahili, that is commonly done inside the verb.

Compare:

• alipiga simu = called / made a phone call
• alinipigia simu = called me
• alikupigia simu = called you
• aliwapigia simu = called them / called you all

So the original sentence does not say who was called; it only says that a call happened.