Supermarketi hii ina ofa nzuri leo, lakini keshia amesema hakuna chenji nyingi.

Because supermarketi is treated as a noun class 9 noun in Swahili, and the this word for that class is hii.

So:

• supermarketi hii = this supermarket

Swahili demonstratives must match the noun class of the noun they describe.
For a learner, the key thing is:

• mtu huyu = this person
• kitabu hiki = this book
• supermarketi hii = this supermarket

Even though supermarketi is a loanword, it still follows Swahili agreement rules.

Ina is the subject prefix + verb stem for to have.

Here is the breakdown:

• i- = subject marker for a class 9 noun like supermarketi
• -na = have / with

So:

• supermarketi hii ina ofa nzuri = this supermarket has good offers

This is one of the most useful Swahili patterns:

• Nina pesa = I have money
• Una muda = you have time
• Ana watoto = he/she has children
• Ina ofa = it has offers

Ofa usually means offer, deal, or special promotion. It is a loanword, ultimately from English.

In everyday modern Swahili, especially in shopping or advertising, ofa is very common.

Examples:

• ofa nzuri = a good offer / good deals
• kuna ofa leo = there are offers today

So even if the sentence’s meaning is already clear, it helps to know that this is a very normal retail word.

The adjective -zuri must agree with the noun class of ofa.

Ofa behaves like a class 9/10 noun, and the class 9/10 form of -zuri is nzuri.

So:

• ofa nzuri = good offer / good offers

This same pattern appears with many class 9/10 nouns:

• nyumba nzuri = a good house
• habari nzuri = good news
• safari nzuri = a good trip

A useful thing to remember is that many class 9/10 adjective forms begin with n-.

In Swahili, leo by itself means today, and it does not need a preposition.

So:

• leo = today
• kesho = tomorrow
• jana = yesterday

Examples:

• Ninakuja leo = I’m coming today
• Kuna ofa leo = There are offers today

This is similar to English, where we also usually just say today, not on today.

Lakini means but.

It connects two ideas:

• Supermarketi hii ina ofa nzuri leo = This supermarket has good offers today
• lakini keshia amesema hakuna chenji nyingi = but the cashier said there isn’t much change

So lakini is a very common contrast word, just like but in English.

Other examples:

• Ninataka kwenda, lakini nimechoka. = I want to go, but I’m tired.
• Ni nzuri, lakini ni ghali. = It’s nice, but it’s expensive.

Yes. Keshia is a loanword meaning cashier.

It is common in everyday speech, especially in shops, supermarkets, and restaurants.

So:

• keshia amesema... = the cashier said...

Because many job titles and modern business words are borrowed, you will often see forms like this in Swahili.

Both can often translate as said, but they are not exactly the same.

• amesema = has said / said with present relevance
• alisema = said in a more simple past sense

Breakdown of amesema:

• a- = he/she
• -me- = perfect tense
• -sema = say

So keshia amesema... suggests something like:

• the cashier has said...
• or the cashier said... and that statement is still relevant now

In this sentence, that makes sense, because the lack of change matters right now.

Hakuna means there is no or there are no.

It is one of the most common Swahili expressions.

Examples:

• Hakuna shida = No problem
• Hakuna watu = There are no people
• Hakuna maji = There is no water

In your sentence:

• hakuna chenji nyingi = there isn’t much change / there isn’t a lot of change available

It introduces non-existence or absence.

Yes, very literally it looks like much/many change.

Chenji means change in the money sense, especially small money returned after payment.
Nyingi means much / many / a lot, depending on context and noun class.

So:

• chenji nyingi = a lot of change / much change

In natural English, we would usually say:

• there isn’t much change
• they don’t have a lot of change

Swahili often uses -ingi forms in places where English might choose much, many, or a lot of.

Not necessarily. It usually means there isn’t much change or there isn’t a lot of change.

That is slightly different from saying there is absolutely no change.

Compare:

• hakuna chenji = there is no change
• hakuna chenji nyingi = there isn’t much change / there isn’t a lot of change

So the version in the sentence sounds a bit softer and more realistic in a shop situation: the cashier may have some change, but not a large amount.

Swahili often allows reported speech or reported statements without needing kwamba.

So both of these are possible:

• Keshia amesema hakuna chenji nyingi.
• Keshia amesema kwamba hakuna chenji nyingi.

The second one is a bit more explicit:

• kwamba = that

But in everyday speech, Swahili frequently omits kwamba when the meaning is already clear.

So the sentence is natural and normal as written.

Yes, they are all loanwords or modern borrowed forms, and that is completely normal.

In this sentence:

• supermarketi = supermarket
• ofa = offer
• keshia = cashier
• chenji = change

Modern Swahili uses many borrowed words, especially for:

• business
• technology
• shopping
• transport
• administration

What matters for learners is that even borrowed words usually still follow Swahili grammar, especially agreement patterns.

So a sentence can contain several English-derived words and still be fully grammatical Swahili.