Η δήλωση απώλειας είναι έτοιμη.

No. Here Η is the definite article meaning the.

• η = the for feminine singular
• It is capitalized as Η only because it is at the beginning of the sentence.
• It is not the pronoun she.

In this sentence, Η δήλωση means the declaration / the statement / the report.

δήλωση is a feminine singular noun in the nominative case, because it is the subject of the sentence.

A few useful points:

• Dictionary form: η δήλωση
• Gender: feminine
• Number: singular
• Case here: nominative

This noun type is very common in Greek: nouns ending in -ση are often feminine, for example:

• η απάντηση = the answer
• η ανακοίνωση = the announcement
• η δήλωση = the declaration / statement

απώλειας is the genitive singular form of η απώλεια.

• Nominative: η απώλεια
• Genitive: της απώλειας

It is in the genitive because Greek often uses the genitive to show a relationship like of in English.

So:

• δήλωση απώλειας literally = declaration of loss
• very naturally in English: loss declaration or report of loss

Greek often uses the genitive after one noun to specify what kind of thing it is.

So δήλωση απώλειας means:

• a declaration of loss
• a report of loss

This is very common in formal or administrative Greek. It works much like English of or like an English noun modifying another noun.

Similar patterns:

• πιστοποιητικό γέννησης = certificate of birth / birth certificate
• άδεια οδήγησης = license of driving / driving license

Because Greek often leaves out the article in this kind of fixed or official noun phrase.

So δήλωση απώλειας sounds like a standard category or document name: loss declaration/report.

If you added the article, δήλωση της απώλειας, it would sound more like:

• the declaration of the loss
• referring to a specific loss already known in the conversation

So both are possible in Greek, but they do not sound exactly the same.

Because adjectives in Greek must agree with the noun they describe.

The noun here is δήλωση, which is:

• feminine
• singular
• nominative

So the adjective must also be:

• feminine
• singular
• nominative

That gives:

• masculine: έτοιμος
• feminine: έτοιμη
• neuter: έτοιμο

Since δήλωση is feminine, we say έτοιμη.

είναι is the verb is / are from είμαι = to be.

In this sentence it links the subject and the adjective:

• Η δήλωση απώλειας είναι έτοιμη.
• The loss declaration is ready.

Greek often drops subject pronouns like I, you, he, because the verb ending already shows the person. But the verb to be itself is normally still present in a full sentence like this.

In casual situations, you may sometimes hear shortened or elliptical speech, but the full standard sentence uses είναι.

You can tell from both form and structure:

• Η δήλωση is in the nominative, which is the usual case for the subject.
• έτοιμη agrees with δήλωση, not with απώλειας.
• απώλειας is genitive, so it depends on δήλωση and cannot be the main subject.

So the core structure is:

• Η δήλωση απώλειας = subject
• είναι = verb
• έτοιμη = predicate adjective

Yes. Greek word order is more flexible than English, because the endings show the grammatical relationships.

The neutral, standard order is:

• Η δήλωση απώλειας είναι έτοιμη.

But other orders are possible for emphasis, for example:

• Έτοιμη είναι η δήλωση απώλειας.
  Emphasis on ready
• Η δήλωση απώλειας έτοιμη είναι.
  Less neutral, more marked or stylistic

For a learner, the given order is the safest and most natural one to use.

A simple pronunciation guide is:

• Η δήλωση απώλειας είναι έτοιμη
• i DÍ-lo-si a-PÓ-li-as Í-ne É-ti-mi

The accent marks show which syllable is stressed:

• δήλωση → stress on δή
• απώλειας → stress on πώ
• είναι → stress on εί
• έτοιμη → stress on έ

Stress is important in Greek, so the written accent marks are not optional in normal writing.

Yes, it sounds fairly formal or administrative.

The phrase δήλωση απώλειας is the kind of expression you would expect in:

• a police station
• a public office
• a bank
• an insurance context
• official paperwork

In everyday conversation, people might use other wording depending on the context, but this sentence sounds completely natural in official or service-related situations.