Αν δεν υποβάλεις όλα τα χαρτιά έγκαιρα, υπάρχει κίνδυνος απόρριψης.

Αν means if and introduces the condition.

So Αν δεν υποβάλεις όλα τα χαρτιά έγκαιρα... means If you do not submit all the documents on time...

In Modern Greek, αν is the normal everyday word for if in this kind of sentence.

This is a very common learner question.

• υποβάλλεις = present tense, you submit / you are submitting
• υποβάλεις = aorist subjunctive-type form used after words like αν, meaning you submit as a single completed action

Here the sentence is talking about one complete act: submitting the required paperwork. That is why Greek uses υποβάλεις.

So after αν, Greek often uses this kind of form instead of a normal present tense form.

In Greek, after αν, you normally do not use θα in this kind of conditional sentence.

English says:

• If you don’t submit... there is a risk...

Greek says:

• Αν δεν υποβάλεις...

Even though the meaning is future-oriented, Greek handles it through αν + verb form, not αν + θα.

So αν δεν θα υποβάλεις would be wrong here.

Δεν is the normal negation word for verbs in statements. It means not.

It usually comes directly before the verb:

• δεν υποβάλεις = you do not submit

So:

• Αν δεν υποβάλεις... = If you do not submit...

This placement is very normal in Greek.

Greek usually does not need subject pronouns because the verb ending already shows the subject.

Here, υποβάλεις tells you that the subject is you singular.

So Greek can simply say:

• Αν δεν υποβάλεις...

If you added εσύ, it would sound more emphatic:

• Αν εσύ δεν υποβάλεις...

That would mean something like if you yourself don’t submit...

Yes, literally χαρτιά means papers, but in many contexts it really means documents / paperwork.

So in this sentence, όλα τα χαρτιά is best understood as:

• all the documents
• all the paperwork
• all the required papers

This is a very common use in Greek, especially in administrative or official situations.

Greek normally uses the article in expressions like this.

• όλα = all
• τα = the (neuter plural article)
• χαρτιά = papers / documents

So:

• όλα τα χαρτιά = all the documents

Also, the words agree with each other:

• όλα = neuter plural
• τα = neuter plural
• χαρτιά = neuter plural

Using the article here is the standard natural Greek structure.

Έγκαιρα means in time, on time, or by the deadline, depending on context.

In a sentence about submitting documents, it usually has the sense of:

• before it is too late
• within the required time
• by the deadline

So it fits formal or administrative language very well.

Because έγκαιρα is an adverb, and Greek often places adverbs after the object.

So:

• υποβάλεις όλα τα χαρτιά έγκαιρα

literally looks like:

• submit all the documents on time

Greek word order is somewhat flexible, but this order is very natural.

You could sometimes move έγκαιρα for emphasis, but the version in the sentence is standard and smooth.

Literally, it means:

• there exists a risk of rejection

Breaking it down:

• υπάρχει = there is / there exists
• κίνδυνος = risk / danger
• απόρριψης = of rejection

So the phrase is a formal way to say that rejection is a possibility.

Because it is in the genitive case.

After nouns like κίνδυνος (risk), Greek often uses the genitive to express of ...

So:

• κίνδυνος απόρριψης = risk of rejection

The base noun is:

• η απόρριψη = the rejection

Its genitive singular is:

• της απόρριψης = of the rejection

Here the article is omitted, which is very normal in this type of formal expression:

• κίνδυνος απόρριψης

Yes, it sounds fairly formal and is especially natural in administrative, legal, academic, or bureaucratic contexts.

Expressions like:

• υποβάλεις όλα τα χαρτιά
• υπάρχει κίνδυνος απόρριψης

are very typical of official Greek.

In everyday conversation, someone might say something a little less formal, but this sentence is completely natural and correct.