Στο σούπερ μάρκετ αγοράζω φράουλες και κεράσια όταν είναι φρέσκα.

Στο is the contracted form of σε το.

• σε = in / at / to (depending on context)
• το = the for a neuter singular noun

So:

• σε το σούπερ μάρκετ → στο σούπερ μάρκετ

In this sentence, στο σούπερ μάρκετ means at/in the supermarket.

It’s a loanword from English supermarket. In Modern Greek, words like this are very common.

A useful thing to notice is that σούπερ μάρκετ is usually treated as an indeclinable noun, meaning its form does not change much. Instead, the article shows the gender, number, and case:

• το σούπερ μάρκετ
• στο σούπερ μάρκετ

It is normally treated as neuter singular.

Greek often leaves out subject pronouns because the verb ending already tells you who the subject is.

• αγοράζω = I buy

So Greek does not need εγώ here.

If you say Εγώ αγοράζω, that sounds more emphatic, like:

• I buy...
• As for me, I buy...

Αγοράζω is present tense, first person singular.

Depending on context, a Greek present tense can mean either:

• I buy
• I am buying

In this sentence, it sounds habitual/general, so I buy is the most natural interpretation.

That is because the sentence describes a repeated pattern: buying those fruits when they are fresh.

They are the direct objects of αγοράζω—they are the things being bought—so they appear in the accusative plural.

• φράουλες = strawberries
• κεράσια = cherries

A helpful detail:

• φράουλες is feminine plural
• κεράσια is neuter plural

In these nouns, the accusative plural looks the same as the nominative plural.

Because Greek, like English, can use bare plurals for things in a general or indefinite sense.

So:

• αγοράζω φράουλες και κεράσια = I buy strawberries and cherries

If you added articles:

• αγοράζω τις φράουλες και τα κεράσια

that would usually sound more like the strawberries and the cherries, meaning specific ones.

Όταν means when and introduces a time clause.

So:

• όταν είναι φρέσκα = when they are fresh

In this sentence, όταν helps express a repeated or usual situation:

• I buy them when they’re fresh.

This is a very common Greek pattern: present tense in the main clause + present tense after όταν for habitual meaning.

Yes. In Modern Greek, είναι is used for both:

• he/she/it is
• they are

So the same form covers third person singular and third person plural.

The context tells you which meaning is intended.
Here it clearly means they are, referring to the fruit.

This is a very good question.

The adjective refers back to φράουλες και κεράσια, which is a mixed-gender plural group:

• φράουλες = feminine plural
• κεράσια = neuter plural

When Greek refers to mixed inanimate things together, it often uses the neuter plural adjective as the default. That is why φρέσκα is natural here.

Compare:

• Οι φράουλες είναι φρέσκες. = The strawberries are fresh.
• Τα κεράσια είναι φρέσκα. = The cherries are fresh.
• Οι φράουλες και τα κεράσια είναι φρέσκα. = The strawberries and cherries are fresh.

So φρέσκα is covering both nouns together.

Yes. Greek word order is more flexible than English word order.

This sentence begins with:

• Στο σούπερ μάρκετ

That puts the place first, setting the scene.

You could also say:

• Αγοράζω φράουλες και κεράσια στο σούπερ μάρκετ όταν είναι φρέσκα.

That is still understandable and natural, but the focus shifts a little.
The original version sounds smooth because it starts with the location and then gives the action.

Not necessarily.

Without a comma, the clause feels tightly connected to the main idea:

• Στο σούπερ μάρκετ αγοράζω φράουλες και κεράσια όταν είναι φρέσκα.

That is perfectly fine.

Some writers might add a comma for rhythm or emphasis, but in a sentence like this, no comma is completely natural.