Ο ασφαλισμένος υπέγραψε το έντυπο.

Because ασφαλισμένος is an adjective that is being used like a noun.

• As an adjective, ασφαλισμένος means insured.
• With the article ο, it becomes ο ασφαλισμένος, literally the insured (man/person).

Greek does this very often: an adjective with the article can stand in for a noun that is understood from context.

So in this sentence:

• ο ασφαλισμένος = the insured person / the policyholder / the insured man

The exact English wording depends on context.

They are the definite articles, equivalent to the in English.

In this sentence:

• ο = the for a masculine singular noun/adjective in the nominative
• το = the for a neuter singular noun in the accusative here

So:

• ο ασφαλισμένος = the insured person
• το έντυπο = the form

Unlike English, Greek articles change depending on gender, number, and case.

In this sentence:

• ο ασφαλισμένος is in the nominative singular
• το έντυπο is in the accusative singular

Why?

• The subject of the sentence is normally in the nominative.
• The direct object is normally in the accusative.

So:

• ο ασφαλισμένος = the one who did the action → subject → nominative
• το έντυπο = the thing that was signed → direct object → accusative

A useful detail: έντυπο is neuter, and many neuter nouns have the same form in the nominative and accusative singular. So here the article το and the sentence structure help you understand the function.

υπέγραψε is the aorist form, third person singular.

Here it means:

• he signed
• she signed
• it signed (not likely here, of course)

In this sentence, it matches ο ασφαλισμένος, so the meaning is the insured person signed.

The Greek aorist usually expresses a completed action, which is why υπέγραψε is the natural choice for signed.

The dictionary form is υπογράφω, meaning to sign.

The forms are:

• υπογράφω = I sign / I am signing
• υπέγραψα = I signed
• υπέγραψε = he/she signed

So υπέγραψε is an aorist form built from υπογράφω.

You may notice the form changes quite a bit:

• υπογράφω
• υπέγραψε

That is normal in Greek verbs. The aorist often has:

• an augment at the beginning, like ε
• a changed stem
• characteristic aorist endings

Because Greek aorist forms are not always made by simply adding an ending to the present stem.

With υπογράφω, the aorist is based on the stem υπέγραψ-. This involves two common features:

1. Stem change

   • Present: -γράφ-
   • Aorist: -γραψ-

2. Augment

   • In past tenses, Greek often adds ε-
   • With a prefixed verb like υπογράφω, this shows up inside the word: υπ-έ-γραψε

So:

• υπογράφω → υπέγραψα / υπέγραψε

This is something learners mostly have to get used to by exposure and memorization.

A rough pronunciation guide is:

O as-fa-lis-ME-nos i-PE-gra-pse to EN-di-po

More carefully:

• Ο = o
• ασφαλισμένος = as-fa-lis-ME-nos
• υπέγραψε = i-PE-gra-pse
• το = to
• έντυπο = EN-di-po

The stressed syllables are:

• ασφαλισμένος
• υπέγραψε
• έντυπο

A couple of useful sound notes:

• γρ in υπέγραψε is pronounced together, roughly like gr
• ντ in έντυπο is often pronounced like d in modern Greek, so έντυπο can sound close to édipo

Because Greek often leaves out a noun if an adjective or participle with the article already makes the meaning clear.

So instead of saying something like:

• ο ασφαλισμένος άνθρωπος = the insured person

Greek very naturally just says:

• ο ασφαλισμένος

This is extremely common. Similar patterns are:

• ο υπεύθυνος = the person in charge
• ο τραυματίας = the injured person
• ο άρρωστος = the sick person

So the missing noun is not a problem; it is just standard Greek usage.

Historically and grammatically, it is a participle used adjectivally, and in this sentence it functions like a noun phrase.

You can think of it in layers:

• base idea: from the verb ασφαλίζω = to insure
• participle/adjectival form: ασφαλισμένος = insured
• with article: ο ασφαλισμένος = the insured person

For a learner, the most practical way to understand it here is:

• form: adjective/participle
• job in the sentence: noun phrase, the subject

Yes, it can change.

This order is the most straightforward neutral order:

• subject + verb + object

So:

• Ο ασφαλισμένος = subject
• υπέγραψε = verb
• το έντυπο = object

But Greek word order is more flexible than English because the articles and endings give grammatical information. For example, you could also hear:

• Το έντυπο υπέγραψε ο ασφαλισμένος.
• Υπέγραψε το έντυπο ο ασφαλισμένος.

These alternatives may shift the emphasis, but the basic meaning stays the same.

Because έντυπο is simply a neuter noun in Greek. Nouns in Greek belong to grammatical genders: masculine, feminine, or neuter.

Here:

• το έντυπο = the form

Its gender is a grammatical feature, not something logical or natural like biological sex. Many inanimate nouns are masculine, feminine, or neuter just because that is how the language categorizes them.

So you learn it together with its article:

• το έντυπο, not just έντυπο

That helps you remember both its gender and how it behaves grammatically.

Yes. Depending on context, έντυπο can mean:

• form
• printed document
• printed matter
• template/form document

In this sentence, form is the most natural translation, especially in insurance, legal, or administrative contexts.

So:

• Ο ασφαλισμένος υπέγραψε το έντυπο. = The insured person signed the form.

But in another context, έντυπο might refer more generally to a printed document.

From the verb ending.

In Modern Greek, verb endings show the person and number. Here:

• υπέγραψε = third person singular

That means:

• he signed
• she signed

It cannot mean:

• I signed → υπέγραψα
• we signed → υπογράψαμε
• they signed → υπέγραψαν or υπογράψαν

Since the subject is ο ασφαλισμένος (the insured person), the meaning is clearly the insured person signed.

If you mean the insured person as a specific subject, yes, the article is normally needed:

• Ο ασφαλισμένος υπέγραψε το έντυπο.

Without the article, ασφαλισμένος would usually sound adjectival rather than like a complete noun phrase, or it would need a different context.

Compare:

• ο ασφαλισμένος = the insured person
• ασφαλισμένος πελάτης = an insured customer / insured customer

So in this sentence, the article is important because ασφαλισμένος is standing on its own as the subject.