Κάθε πρωί ανοίγω την μπαλκονόπορτα και αερίζω το υπνοδωμάτιο για δέκα λεπτά.

Κάθε means every/each, and it is commonly used without an article in time expressions like:

• κάθε μέρα = every day
• κάθε βράδυ = every evening
• κάθε πρωί = every morning

So Κάθε πρωί is a fixed, natural way to say every morning. Greek does not need an article here.

In this sentence, the Greek present tense is being used for a habitual/repeated action, just like English present simple:

• I open
• I air out / ventilate

So ανοίγω and αερίζω mean I open and I air out in the sense of something the speaker does regularly. The sentence describes a routine, not something happening only right now.

Because of the verb endings.

In Modern Greek, the 1st person singular (I) often ends in -ω:

• ανοίγω = I open
• αερίζω = I air out
• γράφω = I write

A 3rd person singular form would be different:

• ανοίγει = he/she/it opens
• αερίζει = he/she/it airs out

So the -ω ending tells you the subject is I, even though the pronoun εγώ is not written.

Greek usually does not state the subject pronoun unless it is needed for emphasis or contrast.

So:

• Ανοίγω already means I open
• Αερίζω already means I air out

Adding εγώ would sound more emphatic, like I open..., perhaps to contrast with someone else.

This is very normal in Greek. The verb ending usually gives enough information.

Μπαλκονόπορτα is a feminine noun, so it takes the feminine article:

• nominative: η μπαλκονόπορτα
• accusative: την μπαλκονόπορτα

Here it is the direct object of ανοίγω (I open what? the balcony door), so Greek uses the accusative: την μπαλκονόπορτα.

It is a compound noun:

• μπαλκόνι = balcony
• πόρτα = door

So μπαλκονόπορτα literally means something like balcony door or patio door / door to the balcony.

Greek often forms compound words like this.

Because υπνοδωμάτιο is a neuter noun.

Its article is:

• nominative: το υπνοδωμάτιο
• accusative: το υπνοδωμάτιο

So the form stays the same in both nominative and accusative. That is very common with neuter nouns in Greek.

Here it is the object of αερίζω (I air out what? the bedroom), so it is accusative, but for this neuter noun the article is still το.

They describe two related but different actions:

• ανοίγω την μπαλκονόπορτα = I open the balcony door
• αερίζω το υπνοδωμάτιο = I air out / ventilate the bedroom

So first the speaker opens the door, and then lets fresh air into the room.

Αερίζω is not just open; it specifically means to air out, to ventilate, or to let fresh air in.

Because both verbs share the same subject: I.

Greek, like English, can connect two actions with και = and:

• ανοίγω ... και αερίζω ...
• I open ... and air out ...

There is no need to repeat the subject pronoun or add extra words. The sentence is naturally understood as one person doing both actions.

It expresses duration: for ten minutes.

• για = for
• δέκα = ten
• λεπτά = minutes

So για δέκα λεπτά tells you how long the airing out lasts.

This is a very common pattern in Greek:

• για μία ώρα = for one hour
• για λίγο = for a little while
• για δύο μέρες = for two days

Because the number is δέκα (ten), so the noun is plural:

• ένα λεπτό = one minute
• δύο λεπτά = two minutes
• δέκα λεπτά = ten minutes

Greek uses the plural just as English does in this case.

Because after για in a duration expression, Greek normally uses the form δέκα λεπτά.

Here λεπτά is the normal plural form used in this time expression. You do not need the genitive here.

Compare:

• για δέκα λεπτά = for ten minutes
• διάρκεια δέκα λεπτών = duration of ten minutes

So λεπτών would belong in a different structure.

The word order is natural and straightforward:

• Κάθε πρωί = time expression first
• ανοίγω την μπαλκονόπορτα = first action
• και αερίζω το υπνοδωμάτιο = second action
• για δέκα λεπτά = duration

Putting Κάθε πρωί at the beginning is very common because it sets the scene immediately: this is something the speaker does regularly.

Greek word order is somewhat flexible, but this version sounds very natural.

Both are related to the same article form.

The full accusative feminine article is την, but in everyday speech and writing, the final -ν is often dropped before certain consonants:

• τη μπαλκονόπορτα
• την πόρτα / τη πόρτα

However, many learners first see the fuller spelling την, and it is perfectly correct. Native usage varies depending on pronunciation, spelling style, and what sound follows.

In connected speech, the final -ν of την is usually pronounced before sounds like μπ, π, τ, κ, and similar consonants.

So την μπαλκονόπορτα is typically pronounced with the n clearly heard.

That is one reason why you often keep την in front of words like μπαλκονόπορτα.

Yes. It is built from elements meaning sleep and room:

• ύπνος = sleep
• δωμάτιο = room

So υπνοδωμάτιο literally means sleeping room, i.e. bedroom.

This kind of word formation is common in Greek and can help with vocabulary building.