Μην πατάς την κόρνα χωρίς λόγο, γιατί το μωρό κοιμάται στο πίσω κάθισμα.

Because Μην is used for negative commands in Modern Greek.

• Μην πατάς = Don’t press / stop pressing
• Δεν πατάς would usually mean you are not pressing or you don’t press, which is a statement, not a command.

So if you want to tell someone not to do something, Greek normally uses μη(ν) + the appropriate verb form.

Πατάς is the 2nd person singular form of πατάω / πατώ, meaning to press or step on.

Here it means:

• πατάς την κόρνα = you press the horn / you honk the horn

Greek often expresses this idea literally as press the horn, whereas English more naturally says honk the horn or just honk.

This is a very common Greek pattern:

• μην + present/imperfective subjunctive form → usually for an action seen as repeated, ongoing, or general
• μην + aorist/perfective subjunctive form → usually for a single action

So:

• Μην πατάς την κόρνα = Don’t keep honking / Don’t honk (in general)
• Μην πατήσεις την κόρνα = Don’t press the horn once / in this particular instance

In this sentence, Μην πατάς sounds natural because it gives a general warning or prohibition.

Greek uses the definite article much more often than English.

So την κόρνα literally means the horn, and that is perfectly normal Greek even where English might omit the article or use a different wording.

A few natural Greek patterns are:

• πατάω την κόρνα = press the horn
• χτυπάω την κόρνα = sound the horn / honk

So the article here is not unusual at all.

Literally, it means:

• χωρίς = without
• λόγο = reason

So χωρίς λόγο = without reason or more naturally for no reason.

It is a very common expression in Greek.

Examples:

• Μην θυμώνεις χωρίς λόγο. = Don’t get angry for no reason.
• Φώναζε χωρίς λόγο. = He was shouting for no reason.

Because χωρίς is followed by the accusative in Modern Greek.

So:

• ο λόγος = the reason
• τον λόγο = the reason (accusative)

After χωρίς, you get:

• χωρίς λόγο = without reason

This is a set structure you will see often:

• χωρίς νερό = without water
• χωρίς χρήματα = without money
• χωρίς πρόβλημα = without a problem / no problem

It can mean both, and context tells you which one it is.

In this sentence:

• ..., γιατί το μωρό κοιμάται ... = ..., because the baby is sleeping ...

As a question word, it means why:

• Γιατί γελάς; = Why are you laughing?

So yes, the same word does both jobs.

Yes, μωρό is a neuter noun in Greek.

So:

• το μωρό = the baby
• ένα μωρό = a baby

Greek grammatical gender does not always match natural gender. Even if the baby is a boy or a girl, μωρό is still grammatically neuter.

That is very normal in Greek.

Κοιμάται is the present tense, 3rd person singular, from κοιμάμαι = to sleep.

Here it means:

• το μωρό κοιμάται = the baby is sleeping

Greek present tense often covers both:

• sleeps
• is sleeping

Context decides which is more natural. In this sentence, because it refers to what is happening right now, the best English translation is is sleeping.

Because κοιμάμαι is one of those Greek verbs that has middle/passive endings but an active meaning.

So although κοιμάται may look passive to a learner, it simply means:

• he/she/it sleeps
• is sleeping

This is very common in Modern Greek. Some verbs just use these endings as their normal form.

Στο is a contraction of:

• σε = in / at / to
• το = the

So:

• σε το → στο

Therefore:

• στο πίσω κάθισμα = in the back seat

You will see this contraction all the time:

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

Because πίσω here functions like back/rear and comes before the noun as part of a natural noun phrase:

• το πίσω κάθισμα = the back seat
• η πίσω πόρτα = the back door
• το πίσω μέρος = the back part

Greek often places descriptive words before the noun in these common expressions.

You can also hear other ways of saying in the back seat, such as:

• στο πίσω κάθισμα
• στο πίσω μέρος του αυτοκινήτου = in the back part of the car

But στο πίσω κάθισμα is the most direct match for in the back seat.

It is informal singular.

The clue is πατάς, which is the form used when speaking to one person informally.

If you were speaking more formally or to more than one person, you would use a different form, for example:

• Μην πατάτε την κόρνα χωρίς λόγο...

So:

• πατάς = you, singular informal
• πατάτε = you, plural or formal singular

Yes. A few natural alternatives are possible, depending on style and nuance.

For example:

• Μην κορνάρεις χωρίς λόγο, γιατί το μωρό κοιμάται στο πίσω κάθισμα.

  • using κορνάρω = to honk

• Μην πατήσεις την κόρνα, γιατί το μωρό κοιμάται πίσω.

  • more like Don’t press the horn
  • πίσω = in the back

• Μην κορνάρεις, το μωρό κοιμάται.

  • shorter and more direct

But the original sentence is completely natural and clear.