Ελέγχουμε κατά πόσο η κύρια κατοικία είναι επιλέξιμη κατοικία.

Ελέγχουμε is the verb we check / we verify / we examine.

It comes from the verb ελέγχω = to check / to verify / to audit.

The ending -ουμε shows:

• present tense
• 1st person plural
• so the subject is we

So Ελέγχουμε literally means we are checking or we check.

Greek often does not need a separate word for we, because the verb ending already tells you who the subject is.

Because Greek is a pro-drop language, which means subject pronouns are often omitted when the verb ending already makes the subject clear.

So:

• Ελέγχουμε = we check
• Εμείς ελέγχουμε = we check, but with extra emphasis on we

In a neutral sentence, Greek usually leaves out εμείς.

κατά πόσο is a formal expression meaning something like:

• whether
• to what extent
• as to whether

In this sentence, it introduces what is being checked:

• Ελέγχουμε κατά πόσο... = We check whether...

It is more formal and bureaucratic than simple αν.

Compare:

• Ελέγχουμε αν η κύρια κατοικία είναι... = also possible, more straightforward
• Ελέγχουμε κατά πόσο η κύρια κατοικία είναι... = more formal, administrative style

This kind of phrasing is very common in official Greek.

η is the feminine singular definite article, meaning the.

It is used because κατοικία is:

• feminine
• singular
• here in the nominative case

So:

• η κατοικία = the residence
• η κύρια κατοικία = the main / primary residence

The article has to agree with the noun in gender, number, and case.

Because κύρια is the feminine singular form of the adjective κύριος / κύρια / κύριο.

Since κατοικία is feminine singular, the adjective must agree with it.

So:

• κύριος = masculine singular
• κύρια = feminine singular
• κύριο = neuter singular

Examples:

• ο κύριος λόγος = the main reason
• η κύρια κατοικία = the primary residence
• το κύριο θέμα = the main issue

This is standard adjective agreement in Greek.

είναι means is and comes from the verb είμαι = to be.

The sentence structure is:

• η κύρια κατοικία = the subject
• είναι = is
• επιλέξιμη κατοικία = eligible residence

So Greek uses the verb to be here just like English does:

• The primary residence is an eligible residence.

In this kind of sentence, είναι cannot normally be omitted.

επιλέξιμη is the feminine singular form of the adjective επιλέξιμος / επιλέξιμη / επιλέξιμο, meaning eligible.

Again, it agrees with κατοικία, which is feminine singular.

So:

• επιλέξιμος = masculine
• επιλέξιμη = feminine
• επιλέξιμο = neuter

Because κατοικία is feminine, Greek uses επιλέξιμη.

Greek, especially in formal or administrative language, often repeats the noun instead of replacing it with a shorter phrase.

So:

• η κύρια κατοικία = the primary residence
• επιλέξιμη κατοικία = eligible residence

This repetition sounds natural in official contexts because it keeps the category very explicit.

In more natural everyday speech, speakers might sometimes choose a less repetitive wording, but in legal, governmental, or bureaucratic Greek, repetition like this is very common.

Because επιλέξιμη κατοικία is being used more like a category or classification:
the main residence is being checked to see whether it counts as an eligible residence.

So the second phrase is effectively indefinite:

• η κύρια κατοικία = the primary residence
• επιλέξιμη κατοικία = an eligible residence

Greek often leaves the indefinite article unexpressed, because modern Greek does not have a separate word exactly like English a/an in this kind of use.

If the second phrase had an article, it could change the nuance and sound more specifically referential rather than classificatory.

They are in the nominative singular feminine.

Breakdown:

• η κύρια κατοικία: nominative feminine singular
• επιλέξιμη κατοικία: nominative feminine singular

Why nominative?

• η κύρια κατοικία is the subject
• after είναι, the predicate noun phrase is also typically in the nominative

So both noun phrases match in case because one is the subject and the other is the predicate complement.

Yes, it could.

For example:

• Ελέγχουμε αν η κύρια κατοικία είναι επιλέξιμη κατοικία.

This also means We check whether the primary residence is an eligible residence.

The difference is mostly in tone:

• αν = simpler, more direct, more everyday
• κατά πόσο = more formal, official, bureaucratic

So in an administrative sentence like this one, κατά πόσο sounds very natural.

Yes. In official English, κύρια κατοικία is often translated as:

• primary residence
• main residence
• sometimes principal residence

The exact English choice depends on the legal or administrative context, but the Greek phrase itself is a standard term for the residence that counts as someone’s main home.

Yes, Greek word order is more flexible than English, but not all versions sound equally natural.

The given sentence:

• Ελέγχουμε κατά πόσο η κύρια κατοικία είναι επιλέξιμη κατοικία.

is neutral and natural in formal language.

You might also see variations, but Greek usually keeps this order in official writing because it is clear and orderly:

1. main verb
2. clause introducer
3. subject
4. είναι
5. predicate phrase

So while Greek does allow movement for emphasis, this sentence already uses a very standard formal structure.

A rough pronunciation guide is:

Elénghoume katá póso i kýrja katoikía íne epiléksimi katoikía

A few helpful notes:

• Ελέγχουμε has stress on -λέγ-
• κατά πόσο has stress on τά and πό
• κύρια is pronounced roughly KIR-ya
• είναι is pronounced roughly EE-ne
• επιλέξιμη has stress on λέ

This is only an approximation, but it can help an English speaker get started.

Not really in tone. It is perfectly normal Greek, but it sounds formal and administrative.

Clues:

• κατά πόσο is formal
• the repetition of κατοικία
• the overall style sounds like something from a form, regulation, or official process

An everyday speaker might express the same idea in a simpler way, but in government, legal, financial, or application-related language, this style is very common.