Ο πατέρας μου άνοιξε το καπό, γιατί άκουσε έναν περίεργο ήχο.

In Greek, short possessive words like μου meaning my usually come after the noun.

So:

• ο πατέρας μου = my father
• literally, it is closer to the father my

This is completely normal Greek word order. The noun also usually keeps its article:

• ο αδερφός μου = my brother
• η μητέρα μου = my mother

So ο πατέρας μου is the standard way to say my father.

Greek normally uses the definite article with family nouns and with possessive constructions.

So Greek says:

• ο πατέρας μου = my father
• η αδερφή του = his sister

Even though word-for-word it looks like the father my, in natural English we just say my father.

This is one of the big differences between Greek and English: Greek often keeps the article where English does not.

Άνοιξε is the aorist form of ανοίγω meaning to open.

Here it means:

• he opened

More specifically, it is:

• 3rd person singular
• active voice
• aorist

The aorist is very often used like the English simple past for a completed action:

• άνοιξε = opened
• άκουσε = heard

So in this sentence, both actions are presented as completed events in the past.

Because the sentence is talking about a specific completed event:

• he heard a strange sound
• then he opened the hood

Greek uses the aorist for this kind of whole, completed action.

If Greek wanted to emphasize an ongoing or repeated past action, it would often use the imperfect instead.

Compare:

• άκουσε έναν ήχο = he heard a sound
• άκουγε έναν ήχο = he was hearing a sound or he kept hearing a sound

In your sentence, the aorist fits because the sound is presented as a single event that caused the next action.

This is the direct object of άκουσε meaning heard.

Let’s break it down:

• έναν = a / one, masculine accusative singular
• περίεργο = strange, masculine accusative singular
• ήχο = sound, masculine accusative singular

All three parts match because they refer to the same masculine singular noun in the accusative case.

The nominative forms would be:

• ένας περίεργος ήχος = a strange sound

But after the verb άκουσε, Greek needs the accusative:

• άκουσε έναν περίεργο ήχο = he heard a strange sound

Because it changes from the nominative case to the accusative case.

Dictionary form:

• ο ήχος = the sound

But as a direct object after a verb like hear, Greek uses the accusative:

• τον ήχο = the sound
• έναν ήχο = a sound

So:

• ήχος = subject form
• ήχο = object form

This kind of ending change is very common in Greek.

Here γιατί means because.

Greek γιατί can mean both:

• why?
• because

The meaning depends on the sentence.

In your example:

• Ο πατέρας μου άνοιξε το καπό, γιατί άκουσε έναν περίεργο ήχο.
• My father opened the hood, because he heard a strange sound.

Since it connects two parts of a statement, it means because, not why.

Το καπό means the hood of a car. In British English, this is usually the bonnet.

So:

• American English: hood
• British English: bonnet

This word is very common in everyday Greek when talking about cars.

Yes, Greek word order is more flexible than English word order.

The sentence uses a very neutral, natural order:

• subject + verb + object
• Ο πατέρας μου άνοιξε το καπό

But Greek can move words around for emphasis, contrast, or style.

For example:

• Το καπό άνοιξε ο πατέρας μου can sound more emphatic, like It was the hood that my father opened
• Άνοιξε το καπό ο πατέρας μου is also possible in the right context

Even though Greek allows this flexibility, the version in your sentence is the most straightforward and beginner-friendly.

Because Greek verb endings already show the subject.

For example:

• άνοιξα = I opened
• άνοιξες = you opened
• άνοιξε = he/she/it opened

And:

• άκουσα = I heard
• άκουσες = you heard
• άκουσε = he/she/it heard

So Greek often does not need to say he explicitly. The verb form already tells you it is he/she/it. In your sentence, the subject is already given as ο πατέρας μου, so there is no need to repeat it.

A rough pronunciation is:

• O pa-TE-ras moo A-ni-kse to ka-PO, ya-TI A-kou-se E-nan pe-RI-er-gho I-ho

A few helpful notes:

• αι sounds like e in many modern words, but there is no αι here
• ου in μου sounds like oo
• γιατί is pronounced roughly ya-TI
• χ in ήχο is a harsher sound than English h, like the ch in German Bach or Scottish loch
• ξ in άνοιξε sounds like ks

Not always. Περίεργος / περίεργη / περίεργο can mean:

• strange
• odd
• weird
• sometimes curious

In this sentence, because it is about a sound coming from a car, περίεργο most naturally means strange or odd.

So:

• έναν περίεργο ήχο = a strange sound

Here it suggests that something may be wrong with the car.

Here is the structure:

• Ο πατέρας μου = subject, my father
• άνοιξε = verb, opened
• το καπό = direct object, the hood
• γιατί = because
• άκουσε = verb, heard
• έναν περίεργο ήχο = direct object, a strange sound

So the sentence is:

• main clause: My father opened the hood
• reason clause: because he heard a strange sound

That is why the sentence feels very natural and clear in Greek.