Maji yamo kwenye jagi, na tafadhali usiyamimine juu ya meza.

In Swahili, maji belongs to noun class 6, and class 6 uses ya- agreement. So that is why you get:

• maji yamo
• usiya-mimine

Even though English treats water as a singular mass noun, Swahili grammar does not have to match English grammar. The important thing is to follow the noun class of maji, which is why you see ya- forms with it.

Yamo is a locative form meaning something like are in or are inside.

It is built from:

• ya- = the subject agreement for maji (class 6)
• -mo = a locative element that suggests being inside a place

So Maji yamo kwenye jagi means the water is located inside the jug.

Yes, both relate to location, and that is normal in Swahili.

• yamo gives the idea of being located inside
• kwenye jagi tells you exactly where: in/on/at the jug, which here naturally means in the jug

So this is not bad repetition. It is a natural Swahili way to express location clearly.

Here kwenye means in.

A useful thing to know is that kwenye can mean in, on, or at, depending on the context. With a container like jagi, the natural meaning is in the jug.

So in this sentence:

• kwenye jagi = in the jug

Yes, both are possible.

• kwenye jagi = very common and natural
• katika jagi = also means in the jug
• ndani ya jagi = inside the jug, with stronger emphasis on the interior

So kwenye jagi is not the only option, but it is a very normal everyday choice.

Usiyamimine can be broken down like this:

• usi- = don’t (negative command to one person)
• -ya- = object marker referring to maji
• mimin- = verb root from kumimina
• -e = final vowel used here in this negative command form

So the whole word means don’t pour it or don’t spill it, where it refers to maji.

Because negative commands in Swahili usually use the subjunctive-type ending -e, not the normal dictionary ending -a.

So:

• kumimina = to pour / to spill
• usimimine = don’t pour / don’t spill
• usiyamimine = don’t pour it / don’t spill it

This pattern is very common in Swahili negative commands.

Juu ya meza means on top of the table or, with a verb of movement like pour, onto the table.

So here it means the water should not be poured or spilled so that it ends up on the table’s surface.

No. They look the same, but they do different jobs.

• In usiya-mimine, -ya- is an object marker referring to maji
• In juu ya meza, ya is part of the expression juu ya, meaning on top of / above

So these are two different kinds of ya.

It can mean either, depending on the situation.

• If someone is deliberately transferring liquid, it can mean pour
• If the idea is making a mess, it can feel more like spill

In this sentence, both ideas fit the context. English could translate it as either don’t pour it onto the table or don’t spill it on the table, depending on what the speaker means.

Yes, absolutely.

Maji yako kwenye jagi is very common and natural. Compared with yamo, yako is a bit more general, while yamo more specifically suggests being inside something.

So:

• Maji yako kwenye jagi = very normal
• Maji yamo kwenye jagi = also correct, with a slightly stronger inside sense

You would change usi- to msi-:

Maji yamo kwenye jagi, na tafadhali msiyamimine juu ya meza.

That means The water is in the jug, and please don’t pour/spill it onto the table when speaking to more than one person.