Φορτώνω τις βαλίτσες στο αυτοκίνητο πριν φύγουμε.

Here φορτώνω means I load or I put/load up.

In this sentence, Φορτώνω τις βαλίτσες στο αυτοκίνητο means something like:

• I load the suitcases into the car
• I put the suitcases in the car

A useful thing to know is that φορτώνω is a broader verb. Depending on context, it can mean:

• loading luggage
• loading a truck
• loading goods
• even uploading or loading something in technology

Here, because the object is τις βαλίτσες and the destination is στο αυτοκίνητο, the meaning is clearly physical loading.

Because τις βαλίτσες is the direct object of the verb φορτώνω.

• οι βαλίτσες = the suitcases as the subject
• τις βαλίτσες = the suitcases as the object

So:

• Οι βαλίτσες είναι βαριές. = The suitcases are heavy.
• Φορτώνω τις βαλίτσες. = I load the suitcases.

This is an accusative case form, which is very common after transitive verbs.

Greek uses the definite article very often, especially when talking about specific things already known from the situation.

So τις βαλίτσες suggests the suitcases rather than just suitcases in general.

In English, sometimes we drop the article more easily, but Greek often keeps it. Here it sounds natural because these are understood to be specific suitcases: probably our/the relevant suitcases before leaving.

στο is a contraction of:

• σε = in, into, to, at, on
• το = the for a neuter singular noun

So:

• σε + το = στο

That means:

• στο αυτοκίνητο = in/into the car

This contraction is extremely common in Greek.

Similar forms:

• στον = σε + τον
• στη / στην = σε + τη(ν)
• στα = σε + τα

It can be understood as either, depending on the verb and context.

Greek σε covers several meanings that English often separates:

• in
• into
• to
• at
• sometimes on/onto

Because the verb is φορτώνω and the object is luggage, English usually translates it as into the car.

So in this sentence, στο αυτοκίνητο is most naturally:

• into the car

But the Greek itself uses the same preposition σε.

Because αυτοκίνητο is a neuter noun, and in the singular its nominative and accusative forms are the same.

So:

• το αυτοκίνητο = the car
• βλέπω το αυτοκίνητο = I see the car
• στο αυτοκίνητο = in/into the car

The article changes because of σε + το, but the noun itself stays αυτοκίνητο.

Because after πριν in this kind of sentence, Greek normally uses the subjunctive, and here it uses the aorist subjunctive:

• φύγουμε

This does not mean past tense here. It means something like:

• before we leave

If you used φεύγουμε, that would be the present indicative form, and it would not fit the grammar of this sentence as naturally.

So the sentence uses:

• πριν φύγουμε = before we leave

not:

• πριν φεύγουμε

No. It looks related to the aorist system, but here it is not past tense.

In this sentence, φύγουμε is the aorist subjunctive, 1st person plural:

• we leave
• for us to leave
• after πριν, simply before we leave

This is a very important point in Greek:

• aorist does not always mean past
• in the subjunctive, it usually expresses aspect rather than past time

Here the action of leaving is viewed as a single whole event.

Because πριν itself can introduce the subjunctive clause, so Greek normally says:

• πριν φύγουμε

not:

• πριν να φύγουμε in standard everyday usage here

For learners, the easiest rule is:

• after πριν, expect a subjunctive form
• you often do not need να

So just learn πριν φύγω, πριν φύγεις, πριν φύγουμε, etc. as the normal pattern.

Because φεύγω has a different perfective/aorist stem.

The dictionary form is:

• φεύγω = I leave

But the perfective stem is:

• φύγ-

So you get forms like:

• να φύγω
• να φύγεις
• να φύγουμε

This kind of stem change is common in Greek verbs and is something learners simply have to get used to.

Because Greek usually leaves subject pronouns out when the verb ending already shows who the subject is.

Here:

• φορτώνω = I load
• φύγουμε = we leave

So Greek does not need:

• Εγώ φορτώνω...
• ...πριν εμείς φύγουμε

Those pronouns could be added for emphasis, but they are not normally necessary.

The Greek present tense can cover several meanings depending on context.

So Φορτώνω can mean:

• I load — habitual or general
• I am loading — right now
• sometimes a near-future or planned action, depending on context

In this sentence, the most natural English translation is often:

• I load the suitcases into the car before we leave
• or I’m loading the suitcases into the car before we leave

Context would decide which sounds best.

No, Greek word order is more flexible than English word order.

The given sentence is a natural, neutral order:

• Φορτώνω τις βαλίτσες στο αυτοκίνητο πριν φύγουμε.

But you could also say:

• Πριν φύγουμε, φορτώνω τις βαλίτσες στο αυτοκίνητο.

That puts more focus on the time clause before we leave.

Even though Greek word order is flexible, not every order sounds equally natural in every context. The original version is a very normal everyday sentence.