הקופאית אומרת שיש היום מבצע על קפה, אבל אני לא צריכה עוד קפה בבית.

Because הקופאית is a feminine singular noun, and the verb in the present tense agrees with it.

• אומר = masculine singular
• אומרת = feminine singular

So:

• הקופאי אומר = The male cashier says
• הקופאית אומרת = The female cashier says

The same thing happens later in the sentence with צריכה.

קופאית means female cashier.

The ה־ at the beginning is the definite article, meaning the.

So:

• קופאית = a female cashier
• הקופאית = the female cashier

Related forms:

• קופאי = male cashier
• קופאית = female cashier

Hebrew marks gender in many nouns, especially for occupations like this.

שיש is a very common structure in Hebrew. It is made of:

• ש־ = that
• יש = there is / there are

So שיש היום מבצע literally means something like:

that there is today a sale

More naturally in English: that there is a sale today

This is a very useful pattern:

• אני יודע שיש בעיה = I know that there is a problem
• היא אומרת שיש זמן = She says that there is time

Hebrew often uses יש to mean there is / there are.

So:

• יש מבצע = There is a sale
• יש קפה בבית = There is coffee at home

In the present tense, Hebrew usually does not use a separate word for is/are the way English does.

So instead of something like there is today a sale, Hebrew naturally says:

יש היום מבצע

Yes. In this context, על is used much like English on in phrases such as:

• a sale on coffee
• a discount on shoes

So:

• מבצע על קפה = a sale/promotion on coffee

This is a normal retail expression in Hebrew.

A few related words:

• מבצע = sale / promotion / special offer
• הנחה על... = discount on...
• במבצע = on sale

For example:

• הקפה במבצע = The coffee is on sale
• יש מבצע על תה = There’s a sale on tea

היום means today.

In this sentence:

• יש היום מבצע = There is a sale today

Hebrew word order is somewhat flexible, so you could also hear:

• היום יש מבצע על קפה

Both are natural. The version in your sentence puts היום after יש, which sounds very normal in spoken and written Hebrew.

Hebrew does not use a helper verb like English do in this kind of sentence.

Instead, צריך / צריכה means need or more literally be in need of / be necessary for.

So:

• אני צריכה = I need (said by a female speaker)
• אני לא צריכה = I don’t need (female speaker)

Gender matters here:

• אני לא צריך = said by a male speaker
• אני לא צריכה = said by a female speaker

So the sentence tells you that the speaker is female.

Hebrew often does not need a separate word matching English any.

The phrase:

אני לא צריכה עוד קפה

literally looks like:

I not need more/another coffee

But naturally it means:

I don’t need any more coffee or I don’t need more coffee

Hebrew often leaves that idea to context instead of adding a separate word.

עוד is a very common word with a few related meanings, including:

• more
• another
• still / yet in some contexts

Here, in עוד קפה, it means more coffee or any more coffee.

Examples:

• אני רוצה עוד מים = I want more water
• יש עוד זמן = There is still time
• עוד אחד = another one

So in your sentence:

• לא צריכה עוד קפה = don’t need more coffee / don’t need any more coffee

Because it means coffee in a general, non-specific sense.

• על קפה = on coffee in general
• עוד קפה בבית = more coffee at home

If you used הקפה, that would usually mean the coffee, a specific coffee already known in the conversation.

Compare:

• יש מבצע על קפה = There’s a sale on coffee
• יש מבצע על הקפה הזה = There’s a sale on this coffee

So the lack of ה־ here is completely natural.

In this sentence, בבית most naturally means at home.

It is made of:

• ב־ = in / at
• בית = house / home

So depending on context, בבית can mean:

• in the house
• at home

Here, אבל אני לא צריכה עוד קפה בבית means:

But I don’t need any more coffee at home

That is the most natural English meaning.

Yes, very much so.

The sentence breaks down like this:

• הקופאית אומרת = The cashier says
• שיש היום מבצע על קפה = that there is a sale on coffee today
• אבל אני לא צריכה עוד קפה בבית = but I don’t need any more coffee at home

This is a very normal Hebrew structure:

1. main clause
2. ש־ clause
3. contrasting clause with אבל

So this is not an unusual or literary sentence; it sounds natural and everyday.

Almost the same, but one word would change.

A male speaker would say:

הקופאית אומרת שיש היום מבצע על קפה, אבל אני לא צריך עוד קפה בבית.

The only change is:

• צריכה → צריך

because the speaker is now masculine.

Everything else can stay the same, since הקופאית is still feminine and still takes אומרת.