Το πάπλωμα είναι πολύ χοντρό για το καλοκαίρι.

Because πάπλωμα is a neuter noun in Greek. Many Greek nouns ending in -μα are neuter.

So in this sentence:

• το πάπλωμα = the duvet/quilt
• το is the neuter singular definite article

Since πάπλωμα is the subject, it is in the nominative case, but for this noun the nominative form is simply πάπλωμα.

They are both definite nouns here, so they both take the article το.

• το πάπλωμα = the duvet/quilt
• το καλοκαίρι = the summer

Greek uses the definite article more often than English does. With seasons and time expressions, Greek very often keeps the article, so για το καλοκαίρι sounds natural.

Greek adjectives must agree with the noun they describe in:

• gender
• number
• case

Since πάπλωμα is:

• neuter
• singular
• nominative

the adjective must also be neuter singular nominative:

• masculine: χοντρός
• feminine: χοντρή
• neuter: χοντρό

So το πάπλωμα είναι πολύ χοντρό is correct.

Here χοντρό means thick.

It is a common adjective that can describe:

• objects: χοντρό βιβλίο = a thick book
• clothing/bedding: χοντρό πάπλωμα = a thick duvet
• sometimes other ideas, depending on context

With bedding, χοντρό usually refers to something physically thick, heavy, or warm.

Literally, πολύ means very or a lot.

So word-for-word, πολύ χοντρό is very thick.

But in the full phrase πολύ χοντρό για το καλοκαίρι, English often naturally expresses the idea as too thick for the summer, because the phrase implies that it is excessively thick for that season.

So:

• literal sense: very thick
• natural overall meaning: too thick for summer

για often means for.

In this sentence, για το καλοκαίρι means for the summer or for summertime.

So the phrase tells us what standard or situation we are judging the duvet against:

• thick in relation to summer
• suitable or unsuitable for summer use

This is a very common use of για in Greek.

After για, Greek uses the accusative case.

So το καλοκαίρι here is accusative.

However, with many neuter singular nouns, the nominative and accusative forms are identical, so you do not see any visible change:

• nominative: το καλοκαίρι
• accusative: το καλοκαίρι

That is why it looks the same.

Because Greek commonly uses the article with seasons, especially in ordinary speech.

Examples:

• το καλοκαίρι = the summer / in summer
• τον χειμώνα = the winter / in winter
• την άνοιξη = the spring / in spring

So για το καλοκαίρι is the normal, natural phrasing. A bare καλοκαίρι would sound less standard in this kind of sentence.

Not completely. Greek word order is more flexible than English word order.

The sentence:

• Το πάπλωμα είναι πολύ χοντρό για το καλοκαίρι

is the most neutral and natural version.

But Greek can move parts around for emphasis. For example:

• Για το καλοκαίρι, το πάπλωμα είναι πολύ χοντρό.

This puts extra focus on for the summer.

So the original order is the best basic version to learn, but it is not the only possible order.

A rough pronunciation is:

to PAP-lo-ma EE-ne po-LEE hon-DRO ya to ka-lo-KE-ri

A few helpful notes:

• πάπλωμα: stress on πά
• είναι: usually pronounced roughly EE-ne
• πολύ: stress on the second syllable
• χοντρό: stress on the last syllable
• καλοκαίρι: stress on καί

Also, χ in χοντρό is not the English ch sound. It is a harsher sound, like the ch in German Bach or Scottish loch.

They are not exactly the same thing.

• πάπλωμα = duvet, quilt, comforter
• κουβέρτα = blanket

A πάπλωμα is usually thicker and more padded, so it fits this sentence well. If something is too warm or too heavy for summer, πάπλωμα is a very natural word to use.

You would say:

Τα παπλώματα είναι πολύ χοντρά για το καλοκαίρι.

The changes are:

• το → τα
• πάπλωμα → παπλώματα
• χοντρό → χοντρά

Notice that είναι stays the same. In the present tense, είναι can mean both is and are, depending on the subject.