Tafadhali, usiweke siki nyingi kwenye kachumbari.

Usiweke comes from the verb kuweka, meaning to put / to place.

It breaks down like this:

• u- = you singular
• -si- = negative marker
• -weke = the verb stem in the subjunctive form

So usiweke is the normal way to tell one person don’t put ...

A very useful pattern is:

• usi + verb = don’t ... to one person
• msi + verb = don’t ... to more than one person

Examples:

• usiende = don’t go
• usifanye = don’t do
• msiende = don’t go, all of you

That -e ending is very important in Swahili.

The dictionary form is kuweka. But in commands like this, especially negative commands, Swahili uses the subjunctive-style ending -e instead of the final -a.

So:

• kuweka → weke
• usiweke = don’t put

This is completely normal in Swahili grammar. English speakers often notice it because English does not change verbs this way in commands.

Because adjectives in Swahili have to agree with the noun class of the noun they describe.

Siki belongs to the N-class noun group, so -ingi becomes nyingi.

So:

• siki nyingi = much / a lot of vinegar

Compare:

• maji mengi = a lot of water
• vitabu vingi = many books
• ndizi nyingi = many bananas

Even though vinegar is uncountable in English, Swahili still uses normal noun-class agreement.

Kwenye is a very common location word. Depending on context, it can mean:

• in
• on
• at

In this sentence, kwenye kachumbari means in the kachumbari.

It is a very natural everyday way to express location. Other possible ways to say something similar are:

• katika kachumbari = in the kachumbari
• ndani ya kachumbari = inside the kachumbari

But kwenye is extremely common and conversational.

Kachumbari is a well-known East African dish, usually a fresh mixture of chopped tomatoes, onions, and sometimes chili, coriander, cucumber, and other ingredients.

In English, people often translate it loosely as:

• salad
• tomato-onion salad
• relish

But very often it is best just to keep the cultural word kachumbari, since it refers to a specific kind of dish.

Yes. Tafadhali means please.

It is a polite word and can appear:

• at the beginning: Tafadhali, usiweke ...
• at the end: Usiweke ... tafadhali.

Both are natural.

Starting with tafadhali is very common when you want to sound polite right away.

Because Swahili does not normally use articles like English a, an, or the.

So a noun like siki can mean:

• vinegar
• the vinegar
• some vinegar

And kachumbari can mean:

• kachumbari
• the kachumbari

The exact meaning is understood from context.

This is one of the biggest differences between English and Swahili.

Yes, literally siki nyingi is closer to much vinegar / a lot of vinegar.

In this sentence, because it is a negative instruction, the meaning naturally comes out as don’t put too much vinegar.

If you want to make the idea of too much more explicit, you could say something stronger, for example:

• usiweke siki nyingi kupita kiasi = don’t put too much vinegar / don’t put an excessive amount of vinegar

So the original sentence is natural, but it is slightly less explicit than the English phrase too much.

Yes, often you could.

Both kuweka and kutia can mean to put / to add, depending on context.

• kuweka is a very general verb: put, place
• kutia often has the sense of add / put in, especially with ingredients

So something like usitie siki nyingi kwenye kachumbari could also sound natural.

That said, usiweke is perfectly normal here and easy for learners to understand, so it is a good choice.