Όταν μπαίνω στο σπίτι, βγάζω τα παπούτσια μου.

Because this sentence describes a habitual action: something the speaker usually does.

So:

• Όταν μπαίνω στο σπίτι, βγάζω τα παπούτσια μου. = When I come into the house, I take off my shoes.

In Greek, the present tense is often used for repeated or regular actions, just like in English:

• When I get home, I make coffee.
• Όταν γυρίζω σπίτι, φτιάχνω καφέ.

If you wanted to talk about one specific future occasion, Greek would usually change the form:

• Όταν μπω στο σπίτι, θα βγάλω τα παπούτσια μου. = When I enter the house, I will take off my shoes.

So the present here signals a routine, not a single event.

Όταν means when.

It introduces a time clause:

• Όταν μπαίνω στο σπίτι = When I enter the house / When I come into the house

In sentences about habits or repeated actions, Greek commonly uses:

• Όταν + present
• followed by another present

Example:

• Όταν πεινάω, τρώω. = When I’m hungry, I eat.

So in your sentence, Όταν sets up the situation in which the second action happens.

Because στο is the contracted form of σε το.

So:

• σε + το = στο

This contraction is completely normal and expected in modern Greek.

Examples:

• στο σπίτι = to/in the house
• στο σχολείο = to/at school
• στο αυτοκίνητο = in the car

You should think of στο as the standard form in everyday Greek.

Yes. Greek σε covers several meanings that English often separates:

• in
• at
• to
• sometimes into, depending on context

So μπαίνω στο σπίτι literally uses σε, but in English we may translate it as:

• I go into the house
• I enter the house
• I come into the house

The verb μπαίνω already contains the idea of entering, so Greek does not need a special separate word for into the way English often does.

After the preposition σε, Greek uses the accusative case.

So in στο σπίτι:

• στο = σε το
• σπίτι is in the accusative singular

However, with many neuter nouns, the nominative and accusative forms look the same. That is why σπίτι does not visibly change.

Compare:

• το σπίτι = the house
• στο σπίτι = in/to the house

The form of the noun stays σπίτι, but grammatically it is accusative after σε.

Μπαίνω means I enter, I go in, or I come in.

It is a very common everyday verb.

In this sentence:

• μπαίνω στο σπίτι = I enter the house / I come into the house

A useful thing to know is that μπαίνω is intransitive, so it usually goes with a place:

• Μπαίνω στο δωμάτιο. = I go into the room.
• Μπαίνω μέσα. = I go inside.

It is much more common in everyday speech than a more formal verb like εισέρχομαι.

Here βγάζω means I take off or I remove.

So:

• βγάζω τα παπούτσια μου = I take off my shoes

More generally, βγάζω is a very flexible verb and can mean things like:

• take out
• remove
• pull out
• produce
• bring out

Examples:

• Βγάζω το παλτό μου. = I take off my coat.
• Βγάζω τα κλειδιά από την τσάντα. = I take the keys out of the bag.

So the exact meaning depends on context.

Because Greek does not need a reflexive structure here.

English says:

• I take off my shoes

Greek simply says:

• βγάζω τα παπούτσια μου

The verb βγάζω directly takes the object:

• τα παπούτσια = the shoes

Then μου shows whose shoes they are:

• τα παπούτσια μου = my shoes

So this is a normal direct-object structure, not a reflexive one.

Because Greek usually uses the definite article where English often does too, and sometimes even where English might omit it.

So:

• τα παπούτσια μου = my shoes

The structure is:

• article + noun + possessive clitic

Examples:

• το βιβλίο μου = my book
• η τσάντα μου = my bag
• τα κλειδιά μου = my keys

In standard Greek, this article is normally included.

In Greek, the weak possessive forms such as μου, σου, του, της, μας, σας, τους usually come after the noun.

So:

• το βιβλίο μου = my book
• η αδερφή σου = your sister
• τα παπούτσια μου = my shoes

This is the normal pattern.

English puts the possessive before the noun:

• my shoes

Greek usually puts the possessive clitic after it:

• τα παπούτσια μου

No. Μου stays the same.

It means:

• my
• or to me, depending on context

In this sentence it means my.

Examples:

• το παπούτσι μου = my shoe
• τα παπούτσια μου = my shoes
• η τσάντα μου = my bag

So μου does not change for masculine/feminine/neuter or singular/plural nouns.

Because παπούτσια is the plural form of παπούτσι.

• το παπούτσι = the shoe
• τα παπούτσια = the shoes

Since people normally remove both shoes, the plural is used.

In the sentence:

• τα παπούτσια μου = my shoes

This is the neuter plural form.

The given word order is very natural:

• Όταν μπαίνω στο σπίτι, βγάζω τα παπούτσια μου.

But Greek word order is more flexible than English, especially for emphasis.

You could also say:

• Βγάζω τα παπούτσια μου όταν μπαίνω στο σπίτι.

This still means the same thing:

• I take off my shoes when I enter the house.

The original version sounds especially natural because it sets up the time clause first:

• When I enter the house...

Then it gives the main action:

• ...I take off my shoes.

Sometimes yes, depending on context.

• σπίτι literally means house or home
• στο σπίτι can mean at home, to the house, or home, depending on the sentence

But with μπαίνω στο σπίτι, the most direct translation is:

• I enter the house
• I come into the house
• I go into the house

In natural English, many people might say:

• When I come home, I take off my shoes

That is a good natural translation, even though the Greek literally mentions the house/home.

A rough pronunciation guide is:

• Ótan béno sto spíti, vɣázo ta papútsia mu.

Very roughly for an English speaker:

• OH-tan BEH-no sto SPEE-ti, VGA-zo ta pa-POOT-sya moo

A few helpful notes:

• μπ at the beginning of a word is pronounced like b
  • μπαίνω ≈ BEH-no
• γ before α in βγάζω is a voiced sound not exactly like English g
• τσι in παπούτσια sounds roughly like tsya

The stressed syllables are:

• Όταν
• μπαίνω
• σπίτι
• βγάζω
• παπούτσια

A very natural way would be:

• Όταν μπω στο σπίτι, θα βγάλω τα παπούτσια μου.

This means:

• When I enter the house, I will take off my shoes.

Notice the difference:

1. Habit / repeated action

   • Όταν μπαίνω στο σπίτι, βγάζω τα παπούτσια μου.

2. One future event

   • Όταν μπω στο σπίτι, θα βγάλω τα παπούτσια μου.

This is a very important pattern in Greek:

• present + present for habits
• subjunctive/perfective form + future for a specific future event