Η συμφοιτήτριά μου, της οποίας το διαμέρισμα είναι κοντά στο πανεπιστήμιο, έρχεται πάντα νωρίς.

Greek uses the definite article much more often than English. So η συμφοιτήτριά μου is the normal way to say my female fellow student / my classmate.

A very common pattern is:

• η φίλη μου = my friend
• ο αδελφός μου = my brother
• το σπίτι μου = my house

So even though English drops the, Greek normally keeps the article.

συμφοιτήτρια means female fellow student, female classmate, or female university classmate.

It is made from:

• συν-/συμ- = with, together
• φοιτητής / φοιτήτρια = student

So συμφοιτήτρια is specifically someone who studies with you, especially at university.

Because the sentence begins with Η συμφοιτήτριά μου, the form is:

• nominative singular feminine

That is the form used for the subject of the sentence.

This happens because μου is an enclitic, a small unstressed word that often leans on the previous word.

When certain Greek words are followed by enclitics such as μου, σου, του, της, the previous word may get an extra written accent. That is why you see:

• η συμφοιτήτρια
  but
• η συμφοιτήτριά μου

This is a normal spelling rule in Greek and helps reflect the correct stress pattern.

In Greek, possessive weak forms like μου usually come after the noun:

• το βιβλίο μου = my book
• η φίλη μου = my friend
• η συμφοιτήτριά μου = my classmate

So this is just the standard Greek pattern.

Greek can sometimes place a stronger possessive expression elsewhere for emphasis, but in an ordinary sentence noun + μου is the normal choice.

της οποίας means whose.

More literally, it is something like of whom / of which.

The basic relative-pronoun set is:

• ο οποίος = who / which masculine
• η οποία = who / which feminine
• το οποίο = which neuter

Here it appears in the genitive feminine singular form:

• της οποίας

So:

• της οποίας το διαμέρισμα = whose apartment

This is a very standard written way to express possession inside a relative clause.

It agrees with συμφοιτήτρια, not with διαμέρισμα.

That is because της οποίας refers back to the person being described:

• Η συμφοιτήτριά μου ... = the antecedent
• της οποίας ... = whose

Since συμφοιτήτρια is:

• feminine
• singular

the relative pronoun is also:

• feminine
• singular

Meanwhile, το διαμέρισμα is a separate noun inside the relative clause, and it is neuter singular, so it takes its own article το.

Yes, της οποίας sounds more formal or more careful, especially in writing.

In everyday spoken Greek, many speakers would prefer a structure with που, for example:

• Η συμφοιτήτριά μου, που το διαμέρισμά της είναι κοντά στο πανεπιστήμιο, έρχεται πάντα νωρίς.

However, that version may sound a bit heavier or less elegant, and many speakers might instead rephrase the whole sentence more naturally, such as:

• Η συμφοιτήτριά μου, που μένει κοντά στο πανεπιστήμιο, έρχεται πάντα νωρίς.

So:

• της οποίας = more formal/written
• που = more common in speech, often with some rewording

Because διαμέρισμα is a neuter singular noun.

So its article in the nominative singular is το:

• το διαμέρισμα = the apartment

Inside the relative clause, το διαμέρισμα is the subject of είναι:

• το διαμέρισμα είναι κοντά... = the apartment is near...

That is why it stays in the nominative.

στο is the contraction of:

• σε + το = στο

The word κοντά often works with σε when you say something is near a place:

• κοντά σε κάτι = near something

So:

• κοντά στο πανεπιστήμιο = near the university

Literally:

• κοντά σε το πανεπιστήμιο → κοντά στο πανεπιστήμιο

Also note that πανεπιστήμιο is neuter, so with σε it becomes στο πανεπιστήμιο.

Because this is a non-restrictive relative clause: it adds extra information about my classmate, but it does not identify which classmate in a restrictive way.

The main sentence is:

• Η συμφοιτήτριά μου έρχεται πάντα νωρίς.
  = My classmate always comes early.

The middle part simply adds more information:

• της οποίας το διαμέρισμα είναι κοντά στο πανεπιστήμιο
  = whose apartment is near the university

So the commas mark it as extra descriptive information, much like in English.

Because Greek uses the present tense for habitual actions, just as English does in sentences like She always comes early.

Here:

• έρχεται = she comes / she is coming, depending on context

But because of πάντα (always), the meaning is clearly habitual:

• έρχεται πάντα νωρίς = she always comes early

So this is not a one-time action. It describes a regular pattern.

That is the most natural neutral order here:

• έρχεται πάντα νωρίς = she always comes early

Here:

• πάντα = always
• νωρίς = early

Greek word order is somewhat flexible, but different orders can sound more marked or emphatic. For a plain statement, πάντα νωρίς is very natural.

For example:

• έρχεται πάντα νωρίς = neutral, natural
• έρχεται νωρίς πάντα = possible in special contexts, but not the usual neutral choice

Not completely, but the given order is very natural.

The main structure is:

• Η συμφοιτήτριά μου = subject
• της οποίας το διαμέρισμα είναι κοντά στο πανεπιστήμιο = inserted relative clause
• έρχεται πάντα νωρίς = main verb phrase

Greek allows some flexibility, but the relative clause normally comes right after the noun it refers to. That is why it appears immediately after Η συμφοιτήτριά μου.

A more linear version without interrupting the main clause would still usually keep the relative clause next to the noun:

• Η συμφοιτήτριά μου, της οποίας το διαμέρισμα είναι κοντά στο πανεπιστήμιο, έρχεται πάντα νωρίς.

That is already the most natural formal arrangement.

Greek usually requires an article here, where English may or may not use one depending on the phrase.

So Greek says:

• στο πανεπιστήμιο = at / to / near the university

Using the article is the normal Greek pattern. A bare noun without the article would sound incomplete or ungrammatical in this sentence.

So even if English sometimes shortens expressions, Greek generally prefers:

• κοντά στο πανεπιστήμιο not
• κοντά πανεπιστήμιο

Not as written. This sentence clearly refers to a female classmate because of the feminine forms:

• Η
• συμφοιτήτριά
• της οποίας

For a male classmate, you would need masculine forms, for example:

• Ο συμφοιτητής μου, του οποίου το διαμέρισμα είναι κοντά στο πανεπιστήμιο, έρχεται πάντα νωρίς.

So Greek shows grammatical gender very clearly in several places in the sentence.