Στο ίδιο αρτοποιείο αγοράζω συχνά μπουγάτσα με γλυκιά γέμιση, αλλά ο φίλος μου προτιμά σφολιάτα με τυρί.

Στο is the contracted form of σε το.

• σε = in / at / to
• το = the for a neuter singular noun

So:

• σε το αρτοποιείο → στο αρτοποιείο

This contraction is completely standard in modern Greek.
You will often see:

• στο = σε το
• στη = σε τη(ν)
• στον = σε τον

Because ίδιο has to agree with αρτοποιείο.

αρτοποιείο is:

• neuter
• singular

So the adjective must also be neuter singular:

• masculine: ίδιος
• feminine: ίδια
• neuter: ίδιο

In στο ίδιο αρτοποιείο, both το and ίδιο match αρτοποιείο.

After σε, Greek normally uses the accusative case.

So in theory, αρτοποιείο here is accusative singular. However, for many neuter nouns, the nominative and accusative forms are identical, so it looks the same:

• nominative: το αρτοποιείο
• accusative: το αρτοποιείο

That is why you do not see a visible change.

Greek often leaves out subject pronouns when they are already clear from the verb ending.

αγοράζω means I buy, so the I is built into the verb.
Because of that, Greek usually says simply:

• αγοράζω = I buy

Instead of:

• εγώ αγοράζω

You can add εγώ only if you want emphasis or contrast.

αγοράζω is the present tense, and here it expresses a habitual action:

• αγοράζω συχνά = I often buy

So it describes something the speaker does regularly.

Compare:

• αγοράζω = I buy / I am buying
• αγόρασα = I bought
• θα αγοράσω = I will buy

Because the sentence talks about a usual habit, the present tense is the natural choice.

συχνά means often and is an adverb.

In this sentence it comes after the verb:

• αγοράζω συχνά

That is very natural in Greek, but adverbs can often move depending on emphasis. For example:

• Συχνά αγοράζω μπουγάτσα...
• Αγοράζω συχνά μπουγάτσα...

Both are possible. The original version is neutral and common.

Because the speaker is talking about the kind of thing they buy or prefer, not about one specifically identified item.

So Greek often omits the article in this situation:

• αγοράζω μπουγάτσα
• προτιμά σφολιάτα

This is similar to English using a or sometimes just a bare food noun in a general sense.

If the speaker meant a specific one, the article could appear:

• αγοράζω τη μπουγάτσα που φτιάχνουν εκεί = I buy the bougatsa they make there

με means with.

It introduces what the pastry contains or comes with:

• μπουγάτσα με γλυκιά γέμιση = bougatsa with sweet filling
• σφολιάτα με τυρί = puff pastry with cheese

This is a very common Greek pattern for food descriptions:

• πίτα με σπανάκι
• μακαρόνια με κιμά
• καφές με γάλα

Because γέμιση is a feminine noun, so the adjective must agree with it.

• γέμιση = feminine singular
• therefore: γλυκιά = feminine singular form of sweet

Compare the adjective forms:

• masculine: γλυκός
• feminine: γλυκιά
• neuter: γλυκό

So:

• γλυκιά γέμιση = sweet filling

Because this is a general ingredient phrase: with cheese.

Greek often omits the article after με when naming ingredients or materials in a general way:

• με τυρί
• με σοκολάτα
• με κρέας

If you wanted to refer to a specific cheese, you might use an article or a more specific phrase, but here the meaning is simply cheese-filled / with cheese.

Greek usually uses the definite article with nouns much more often than English does.

So ο φίλος μου is the normal way to say my friend.

Structure:

• ο φίλος = the friend
• μου = my

Together:

• ο φίλος μου = my friend

Without the article, φίλος μου can exist in certain contexts, but the full form with the article is the standard neutral choice.

Because in Greek, weak possessive forms like μου (my) usually come after the noun.

So:

• ο φίλος μου = my friend
• η αδερφή μου = my sister
• το σπίτι μου = my house

This is one of the most basic Greek word-order patterns for possession.

In the first clause, the verb ending already tells us the subject is I:

• αγοράζω = I buy

So no pronoun is needed.

In the second clause, the speaker introduces a new subject:

• ο φίλος μου προτιμά = my friend prefers

Since the subject changes from I to my friend, Greek states it clearly. This helps the contrast:

• I often buy...
• but my friend prefers...

αλλά means but.

It connects two contrasting ideas:

• the speaker often buys one thing
• the friend prefers another thing

So the sentence is structured as:

• statement 1
• αλλά
• contrasting statement 2

This is the normal Greek word for but in everyday language.

Grammatically, they are the direct objects of the verbs:

• αγοράζω μπουγάτσα = I buy bougatsa
• προτιμά σφολιάτα = he prefers puff pastry

So they answer the question what?

• What do I buy? → μπουγάτσα
• What does my friend prefer? → σφολιάτα

Culturally, they are also very common Greek food words, so learners often meet them early.

At the beginning of a word, μπ is usually pronounced like b.

So μπουγάτσα is approximately:

• boo-GA-tsa

A few useful pronunciation notes:

• μπ at the beginning of a word ≈ b
• ου = oo
• τσ = ts
• the stress is on γά

So the word sounds much closer to bou-GA-tsa than to something with a separate m sound at the start.

Not completely. Greek word order is more flexible than English word order, because case endings and verb forms carry a lot of grammatical information.

The original sentence is very natural:

• Στο ίδιο αρτοποιείο αγοράζω συχνά μπουγάτσα...

But other versions are possible for emphasis, for example:

• Αγοράζω συχνά μπουγάτσα στο ίδιο αρτοποιείο...
• Συχνά αγοράζω μπουγάτσα στο ίδιο αρτοποιείο...

The original order sounds balanced and natural, with the place phrase first giving the setting.

Putting the place expression first gives the setting immediately:

• At the same bakery, I often buy...

This is very natural in Greek and can sound slightly more connected to previous context, especially if the bakery has already been mentioned.

So the beginning suggests something like:

• At that same bakery...
• In the same bakery...

It helps link this sentence to what came before.