Το τσουρέκι της γιαγιάς μου είναι τόσο αφράτο, που όλοι ζητάνε δεύτερο κομμάτι.

Το is the definite article the for a neuter singular noun in the nominative case.

Here, τσουρέκι is a neuter noun, so you get:

• το τσουρέκι = the tsoureki

Greek nouns have grammatical gender, so the article has to match the noun.

Greek usually expresses possession differently from English.

English:

• my grandmother’s tsoureki

Greek structure:

• the tsoureki of my grandmother
• το τσουρέκι της γιαγιάς μου

So the possessed thing comes first, and the owner comes after it in the genitive:

• της γιαγιάς μου = of my grandmother

A useful pattern is:

• το βιβλίο του φίλου μου = my friend’s book
• το σπίτι της αδερφής μου = my sister’s house

Because μου is a weak possessive form (my) that normally comes after the noun it belongs to.

So:

• η γιαγιά μου = my grandmother
• genitive: της γιαγιάς μου = of my grandmother

This is very normal in Greek:

• ο φίλος μου = my friend
• η μητέρα μου = my mother
• το αυτοκίνητό μου / το αυτοκίνητο μου = my car

So in the sentence, μου belongs to γιαγιάς, not to τσουρέκι.

Because it is in the genitive singular, not the basic dictionary form.

The basic form is:

• η γιαγιά = the grandmother

Its genitive singular is:

• της γιαγιάς = of the grandmother

So:

• η γιαγιά μου = my grandmother
• της γιαγιάς μου = of my grandmother

This case is used here to show possession.

Because adjectives in Greek must agree with the noun they describe in gender, number, and case.

Since τσουρέκι is neuter singular, the adjective must also be neuter singular:

• αφράτος = masculine
• αφράτη = feminine
• αφράτο = neuter

So:

• το τσουρέκι είναι αφράτο

This agreement still happens even after είναι.

This is a very common Greek pattern meaning:

• so … that …

In this sentence:

• είναι τόσο αφράτο, που όλοι ζητάνε δεύτερο κομμάτι
• it is so fluffy/light, that everyone asks for a second piece

So:

• τόσο = so
• που = that

More examples:

• Είναι τόσο κουρασμένος, που κοιμήθηκε αμέσως.
• He is so tired that he fell asleep immediately.

Here που is a conjunction, not a relative pronoun.

It introduces the result clause:

• so fluffy, that everyone asks for a second piece

So in this sentence, που means that.

Greek που can do several jobs in different contexts, but here it is specifically part of the pattern τόσο … που ….

Because που όλοι ζητάνε δεύτερο κομμάτι is a subordinate clause giving the result of what comes before it.

So the comma helps separate:

• the main statement: Το τσουρέκι της γιαγιάς μου είναι τόσο αφράτο
• the result: που όλοι ζητάνε δεύτερο κομμάτι

In a sentence like this, the comma is standard in writing.

Greek often uses όλοι literally meaning all or all people where English would simply say everyone.

So:

• όλοι ζητάνε = everyone asks / they all ask

Why masculine plural? Because Greek commonly uses the masculine plural for a mixed group or for people in general.

Compare:

• όλοι = everyone / all people in general
• όλες = all women / all girls

Yes. Both are correct.

• ζητάνε is very common in everyday spoken Greek
• ζητούν is a bit more formal or stylistically more elevated

So these are both possible:

• όλοι ζητάνε δεύτερο κομμάτι
• όλοι ζητούν δεύτερο κομμάτι

A learner will hear ζητάνε very often in conversation.

Because Greek does not always need the indefinite article where English uses a.

So:

• ζητάνε δεύτερο κομμάτι = they ask for a second piece

This sounds natural and complete.

You could also say:

• ζητάνε ένα δεύτερο κομμάτι

That is also possible, but ένα is not required here. Omitting it is very common, especially when the meaning is already clear.

Because κομμάτι is a neuter singular noun, and δεύτερο has to agree with it.

• δεύτερος = masculine
• δεύτερη = feminine
• δεύτερο = neuter

So:

• δεύτερο κομμάτι = second piece

This is the same kind of agreement you saw with αφράτο.

Yes, Greek word order is more flexible than English, although not completely free.

The given sentence is the most natural neutral version:

• Το τσουρέκι της γιαγιάς μου είναι τόσο αφράτο, που όλοι ζητάνε δεύτερο κομμάτι.

But Greek can move words around for emphasis. For example:

• Όλοι ζητάνε δεύτερο κομμάτι = neutral
• Δεύτερο κομμάτι ζητάνε όλοι = emphasis on second piece
• Της γιαγιάς μου το τσουρέκι = a more emphatic or colloquial way to highlight my grandmother’s

So word order matters for emphasis, not just grammar.

A rough pronunciation guide:

• Το τσουρέκι → to tsoo-REH-kee
• της γιαγιάς μου → tees ya-yaas moo
• είναι → EE-ne
• τόσο → TO-so
• αφράτο → a-FRA-to
• όλοι → O-lee
• ζητάνε → zee-TA-ne
• δεύτερο κομμάτι → THEF-te-ro ko-MA-ti

A few useful notes:

• τσ sounds like ts in cats
• γιαγιά has a soft y sound: ya-ya
• ευ in δεύτερο sounds like ef here because of the following voiceless consonant

The stress marks in Greek show you where to stress the word:

• τσουρέκι
• γιαγιάς
• είναι
• τόσο
• αφράτο
• όλοι
• ζητάνε
• δεύτερο
• κομμάτι