Η ένσταση υποβάλλεται πριν από την προθεσμία υποβολής.

Η is the feminine singular definite article, so it means the.

It agrees with ένσταση, which is a feminine singular noun:

• η ένσταση = the objection

So this tells you the sentence is talking about a specific objection, not just an objection in general.

Ένσταση is in the nominative singular.

It is the subject of the sentence, and in Greek the subject normally appears in the nominative. You can also recognize this from the article:

• η ένσταση = nominative singular feminine

So structurally:

• Η ένσταση = the subject
• υποβάλλεται = the verb

Υποβάλλεται is the present middle/passive form of υποβάλλω.

Here it is:

• 3rd person singular
• present tense
• middle/passive voice

So:

• υποβάλλω = I submit
• υποβάλλεται = it is submitted

In administrative or formal Greek, this passive style is very common, especially when the person doing the action is not mentioned.

Compare:

• Ο ενδιαφερόμενος υποβάλλει την ένσταση. = The interested party submits the objection.
• Η ένσταση υποβάλλεται... = The objection is submitted...

Yes, it is present tense.

But here the present does not necessarily mean something happening right now. In Greek, the present is often used for:

• general rules
• procedures
• official instructions
• habitual actions

So in this sentence, the present has the sense of:

• is submitted
• must be submitted
• is to be submitted

In formal notices, this is very normal Greek.

Yes, πριν από means before, and it is very common before a noun phrase.

So:

• πριν από την προθεσμία = before the deadline

In many contexts, especially in everyday speech, people may also say:

• πριν την προθεσμία

That is also common in Modern Greek. But πριν από often sounds a bit clearer or more formal, which fits this sentence.

A useful distinction:

• πριν από + noun → before a noun
• πριν (να) + clause → before a clause

For example:

• πριν από την προθεσμία = before the deadline
• πριν φύγω = before I leave

Because πριν από is followed by the accusative in Modern Greek.

So:

• η προθεσμία = nominative
• την προθεσμία = accusative

That is why the phrase is:

• πριν από την προθεσμία

The article changes too:

• η → nominative
• την → accusative

Υποβολής is the genitive singular of υποβολή.

Here it depends on προθεσμία:

• προθεσμία υποβολής = literally deadline of submission

This is a very common Greek pattern:

• noun + genitive noun

So:

• η προθεσμία = the deadline
• της υποβολής / υποβολής = of submission

In natural English, we usually turn that into:

• submission deadline rather than
• deadline of submission

Because Greek often leaves the second noun without an article in fixed or semi-fixed expressions like this, especially in formal and administrative language.

So:

• προθεσμία υποβολής = submission deadline
• αίτηση συμμετοχής = application for participation
• ημερομηνία λήξης = expiration date

If you added an article:

• προθεσμία της υποβολής

that would sound more specific, and usually less natural here. The version without the article is the standard bureaucratic/formal expression.

Yes. They come from the same word family:

• υποβάλλω = I submit
• υποβάλλεται = is submitted
• υποβολή = submission
• υποβολής = of submission

This is very common in Greek, especially in formal vocabulary: a verb and a related noun often appear together in the same sentence.

So the sentence is built around the same idea twice:

• the objection is submitted
• before the deadline of submission

That may feel repetitive in English, but it is perfectly normal in Greek official style.

Yes. Greek word order is more flexible than English word order, because case endings and verb forms already show a lot of the grammatical relationships.

The sentence as given:

• Η ένσταση υποβάλλεται πριν από την προθεσμία υποβολής.

is the most neutral and straightforward order.

But you could also see:

• Πριν από την προθεσμία υποβολής υποβάλλεται η ένσταση.

That version gives more emphasis to the time phrase before the submission deadline.

In official writing, both are possible, but the original order is very natural and clear.

Yes, very much so. It sounds like administrative, legal, or bureaucratic Greek.

Clues include:

• the passive verb υποβάλλεται
• the noun phrase προθεσμία υποβολής
• the overall impersonal style

In everyday spoken Greek, someone might say something a bit more direct, such as:

• Πρέπει να υποβάλετε την ένσταση πριν από την προθεσμία.
• Η ένσταση πρέπει να υποβληθεί πριν από την προθεσμία.

But for forms, regulations, and official instructions, the original sentence is completely natural.