Μόλις μπω στο σπίτι, ξεκουμπώνω το παλτό και το κρεμάω πίσω από την πόρτα.

Μπω is the aorist subjunctive of μπαίνω (I enter / go in).

After μόλις meaning as soon as, Greek often uses the subjunctive when the action is in the future or part of a repeated pattern. The aorist here shows the action as a single completed event:

• Μόλις μπω στο σπίτι... = As soon as I go into the house / get home...

So the idea is: first I enter, then I do the next actions.

That is very common for learners to wonder about, because να is often how the subjunctive is introduced.

Here, μόλις itself is enough to trigger that form, so Greek says:

• μόλις μπω not
• μόλις να μπω

So μπω is still a subjunctive form, but να is not used because the conjunction μόλις already sets up the construction.

Στο is a contraction of:

• σε + το = στο

So:

• στο σπίτι = in(to) the house / home

This contraction is completely standard in modern Greek. You will see the same kind of thing with other articles too:

• σε + τη(ν) = στη(ν)
• σε + τα = στα

It can mean either, depending on context.

Literally, σπίτι is house or home, but in everyday Greek, πάω σπίτι, μπαίνω στο σπίτι, είμαι στο σπίτι often correspond very naturally to English go home, get home, be at home.

So in this sentence, even if the literal wording is enter the house, the natural sense is often simply when I get home.

Greek often leaves out the possessive μου when ownership is obvious from context.

Here, if the speaker is talking about their usual routine, it is already clear that the coat is their own coat, so το παλτό sounds perfectly natural.

Compare:

• ξεκουμπώνω το παλτό = I unbutton the coat / my coat
• ξεκουμπώνω το παλτό μου = I unbutton my coat

Adding μου is not wrong; it just makes the possession more explicit.

Ξεκουμπώνω literally means unbutton or undo the buttons of.

So this sentence specifically describes unbuttoning the coat. That is slightly different from βγάζω, which means take off / remove.

• ξεκουμπώνω το παλτό = I unbutton the coat
• βγάζω το παλτό = I take off the coat

In real life, both could make sense in a getting-home routine, but they are not the same verb. The sentence as written focuses on undoing the buttons.

That το means it.

So:

• το παλτό = the coat
• το κρεμάω = I hang it

In Greek, unstressed object pronouns usually come before the verb:

• τον βλέπω = I see him
• την παίρνω = I take her / it
• το κρεμάω = I hang it

Because παλτό is neuter singular, the matching pronoun is το.

Yes. They are two forms of the same verb: to hang.

• κρεμάω
• κρεμώ

Both are used in modern Greek. Κρεμάω is very common in everyday speech and is often the form learners meet first.

So το κρεμάω and το κρεμώ both mean I hang it.

Because πίσω από is the normal way to say behind when a noun follows.

• πίσω on its own can mean back / backwards / behind
• but before a noun, Greek normally uses πίσω από + accusative

So:

• πίσω από την πόρτα = behind the door

Also, την πόρτα is in the accusative, because it comes after the preposition από in this expression.

Because the sentence describes a habitual routine: what the speaker usually does when they get home.

Greek often uses the present tense for repeated or typical actions:

• Μόλις μπω στο σπίτι, ξεκουμπώνω το παλτό και το κρεμάω...
• As soon as I get home, I unbutton my coat and hang it...

If you were talking about one specific future occasion, Greek would more likely use future forms, for example:

• Μόλις μπω στο σπίτι, θα ξεκουμπώσω το παλτό και θα το κρεμάσω...

So the present tense here gives a general, habitual meaning.