Στο έγγραφο δηλώνω ότι η διεύθυνσή μου είναι σωστή.

Στο is a contraction of σε το.

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

So στο έγγραφο means in the document or on the document, depending on context. In Greek, σε + το regularly contracts to στο.

Similar contractions:

• σε + τη → στη
• σε + τον → στον

Έγγραφο is in the accusative singular.

That is because the preposition σε normally takes the accusative in Modern Greek. So:

• το έγγραφο = the document
• στο έγγραφο = in/on the document

The noun έγγραφο is neuter, and in this case the nominative and accusative forms look the same, so you do not see a visible change.

Δηλώνω is the 1st person singular present tense form of the verb δηλώνω, meaning I declare, I state, or I indicate.

So δηλώνω means I declare / I state.

Greek often does not need a separate subject pronoun, because the verb ending already tells you who the subject is. So:

• δηλώνω = I declare
• εγώ δηλώνω = I declare with extra emphasis on I

Ότι introduces a subordinate clause and means that.

So:

• δηλώνω ότι... = I declare that...

In English, that is sometimes optional, but in Greek ότι is very common and natural in this kind of sentence, especially in formal language.

In Greek, possessive words like μου often come after the noun.

So the normal pattern is:

• η διεύθυνσή μου = my address

Literally, this is closer to the address of mine, though that is not how you would translate it naturally.

The article is usually kept:

• η διεύθυνσή μου = my address
• το σπίτι μου = my house
• ο φίλος μου = my friend

Putting μου before the noun is not the normal structure in standard Greek for this meaning.

This is a spelling and stress issue caused by the enclitic μου.

The basic noun is:

• η διεύθυνση

But when an unstressed word like μου follows, Greek often adds an accent to show the stress clearly:

• η διεύθυνσή μου

So the extra accent is not a different word or case. It helps preserve the pronunciation pattern when μου is added.

Η is the feminine singular definite article, meaning the.

The noun διεύθυνση is feminine, so it takes η in the nominative singular:

• η διεύθυνση = the address

In this sentence, η διεύθυνσή μου is the subject of είναι, so it appears in the nominative.

Because adjectives in Greek must agree with the noun they describe in gender, number, and case.

Here, σωστή describes η διεύθυνσή μου. Since διεύθυνση is:

• feminine
• singular
• nominative

the adjective must also be feminine singular nominative:

• σωστός = masculine
• σωστή = feminine
• σωστό = neuter

So:

• η διεύθυνσή μου είναι σωστή = my address is correct

Είναι means is, while είμαι means I am.

The subject here is η διεύθυνσή μου = my address, which is third person singular, so Greek uses:

• είναι = is

Compare:

• είμαι = I am
• είσαι = you are
• είναι = he/she/it is

So η διεύθυνσή μου είναι σωστή literally means my address is correct.

Greek word order is more flexible than English word order.

This sentence could also appear as:

• Δηλώνω στο έγγραφο ότι η διεύθυνσή μου είναι σωστή.

That would still be grammatical. The original version:

• Στο έγγραφο δηλώνω ότι...

puts a little more emphasis on in the document at the start.

So the word order can shift, but the original sounds natural, especially in a formal or bureaucratic context.

Not always. Διεύθυνση can mean different things depending on context, such as:

• address
• direction
• sometimes even management/directorship in other contexts

But in this sentence, because it says the address is correct in a document, the meaning is clearly address in the sense of residence or mailing address.

Yes, it sounds fairly formal and official.

Words and phrasing like:

• στο έγγραφο
• δηλώνω ότι
• είναι σωστή

fit well in administrative, legal, or bureaucratic language.

In everyday speech, a person might say something less formal depending on the situation, but this sentence is very natural in forms, declarations, and official statements.