Η ασφαλιστική εταιρεία απάντησε αμέσως.

A word-by-word breakdown:

• Η — the; the feminine singular definite article
• ασφαλιστική — insurance / insuring; here it describes the company
• εταιρεία — company
• απάντησε — answered / replied
• αμέσως — immediately

So the structure is:

the + insurance + company + answered + immediately

Greek often builds phrases like this very directly.

Η is the feminine singular form of the definite article, meaning the.

It is used because εταιρεία (company) is a feminine singular noun. In Greek, the article has to agree with the noun in:

• gender
• number
• case

So here:

• η = feminine, singular, nominative
• εταιρεία = feminine, singular, nominative
• ασφαλιστική also matches that same pattern because it describes εταιρεία

Here, ασφαλιστική is an adjective modifying εταιρεία.

So:

• ασφαλιστική εταιρεία = insurance company

Literally, it is something like insurance-related company.

A useful extra point: in real Greek, η ασφαλιστική can sometimes be used by itself to mean the insurance company if εταιρεία is understood from context.

Because adjectives and articles must agree with the noun they go with.

The noun here is:

• εταιρεία — feminine singular

So the words connected to it must match:

• η — feminine singular article
• ασφαλιστική — feminine singular adjective

This is a basic Greek agreement pattern:

article + adjective + noun

all matching in gender, number, and case.

It is in the nominative case because it is the subject of the sentence — it is the thing doing the action.

The action is:

• απάντησε — answered / replied

And who answered?

• η ασφαλιστική εταιρεία

That makes it the subject, so nominative is the expected case.

Απάντησε is the aorist form, 3rd person singular, of απαντώ / απαντάω (to answer, to reply).

In this sentence it means:

• answered
• replied

The Greek aorist is commonly used for a completed action in the past. In many sentences like this, it works much like the English simple past.

So:

• απαντά = answers / is answering
• απάντησε = answered

Because Greek usually does not need subject pronouns when the verb ending already shows the person and number.

Απάντησε already tells you it is:

• 3rd person
• singular

So Greek does not need an extra word for it.

English says:

• The insurance company answered immediately

Greek simply uses the noun phrase as the subject and does not add a separate pronoun.

Yes, it can move. Greek word order is more flexible than English word order.

Here:

• Η ασφαλιστική εταιρεία απάντησε αμέσως

is a neutral, natural order.

But Greek could also say things like:

• Η ασφαλιστική εταιρεία αμέσως απάντησε
• Αμέσως απάντησε η ασφαλιστική εταιρεία

These alternatives may sound more marked or may shift emphasis a little, but they are still understandable.

So the final position of αμέσως is just a normal, straightforward placement.

It can mean either, depending on context.

The verb απαντώ / απαντάω is used for:

• answering a question
• replying to a message, email, letter, etc.

So in English, the best translation may be:

• answered
• replied
• sometimes even responded

The exact choice depends on what the company was reacting to.

A rough pronunciation guide:

• Η → ee
• ασφαλιστική → as-fa-lee-stee-KEE
• εταιρεία → e-te-REE-a
• απάντησε → a-PAN-dee-se or a-PAN-ti-se depending on accent/style
• αμέσως → a-ME-sos

Very roughly, the whole sentence sounds like:

ee as-fa-lee-stee-KEE e-te-REE-a a-PAN-dee-se a-ME-sos

The written accent marks show the stressed syllable:

• ασφαλιστική
• εταιρεία
• απάντησε
• αμέσως

Yes, it is a very common collocation for insurance company.

Greek often uses an adjective + noun combination where English might use a noun + noun combination.

Compare:

• ασφαλιστική εταιρεία = insurance company
• literally: insurance-related company

So even if the literal structure feels different from English, it is the normal Greek way to say it.