Το ζευγάρι κάθεται μαζί στο παγκάκι.

A word-by-word breakdown is:

• Το = the
• ζευγάρι = couple
• κάθεται = sits / is sitting
• μαζί = together
• στο = on the / at the / in the here, effectively on the
• παγκάκι = bench

So the whole sentence means something like:

The couple is sitting together on the bench.

Greek often uses the present tense where English might choose either sits or is sitting, depending on context.

Because grammatical gender in Greek does not always match natural gender.

ζευγάρι is a neuter noun, so it takes the neuter article το. Even though a couple refers to two people, the word itself is treated as a single unit, and grammatically that unit is neuter.

This is very similar to how English uses a singular noun like team or family to refer to multiple people.

So:

• το ζευγάρι = the couple
• not because the people are neuter, but because the noun ζευγάρι is neuter

Because the subject is το ζευγάρι, and that is grammatically singular.

Even though a couple includes two people, Greek treats ζευγάρι as one singular noun, so the verb must also be singular:

• Το ζευγάρι κάθεται = The couple is sitting

If you changed the subject to οι δύο άνθρωποι or οι άνθρωποι, then you would use a plural verb.

So the agreement is based on the noun ζευγάρι, not on the number of people inside the idea.

κάθεται is the 3rd person singular form of the verb κάθομαι, which means to sit or to be sitting.

Here it matches the subject:

• το ζευγάρι = the couple → third person singular
• so the verb is κάθεται = it sits / it is sitting

A few related forms are:

• κάθομαι = I sit / I am sitting
• κάθεσαι = you sit / you are sitting
• κάθεται = he/she/it sits / is sitting

This verb is one of those Greek verbs that often appears in middle/passive-style endings, even though the meaning is active in English.

It can mean either one, depending on context.

Greek present tense often covers both:

• a general present: sits
• an action happening now: is sitting

So Το ζευγάρι κάθεται μαζί στο παγκάκι could be understood as:

• The couple sits together on the bench
• The couple is sitting together on the bench

In a normal picture-description context, English would usually say is sitting.

μαζί means together.

It adds the idea that the two members of the couple are with each other, not just both located on the bench separately in some neutral sense.

So:

• Το ζευγάρι κάθεται στο παγκάκι = The couple is sitting on the bench
• Το ζευγάρι κάθεται μαζί στο παγκάκι = The couple is sitting together on the bench

Is it necessary? Not strictly. The sentence is still grammatical without it. But it adds a natural detail.

Because στο is the contracted form of σε το.

In modern Greek, σε + definite article usually combines:

• σε + το → στο
• σε + τη / την → στη / στην
• σε + τα → στα

So:

• στο παγκάκι literally comes from σε το παγκάκι

In this sentence, it means on the bench. Greek σε can cover meanings that English splits into in, at, or on, depending on context.

It is in the accusative case.

The preposition σε normally takes the accusative in modern Greek. Since στο = σε + το, the noun after it is accusative:

• nominative: το παγκάκι
• accusative: το παγκάκι

Here the form happens to look the same, which is very common with neuter nouns.

So the grammar is:

• στο παγκάκι = σε + το παγκάκι = preposition + accusative

Because παγκάκι is a neuter noun, and nouns in Greek simply belong to grammatical gender classes.

It takes the neuter article το:

• το παγκάκι = the bench

Also, the ending -άκι is very often associated with neuter nouns and is commonly a diminutive ending in Greek. Historically or structurally, παγκάκι has that neuter pattern.

For a learner, the important thing is to memorize it as a full unit:

• το παγκάκι

not just παγκάκι by itself.

The word order can change, because Greek is more flexible than English.

The given sentence is a very natural neutral order:

Το ζευγάρι κάθεται μαζί στο παγκάκι.

But you might also hear variations like:

• Το ζευγάρι στο παγκάκι κάθεται μαζί.
• Μαζί κάθεται το ζευγάρι στο παγκάκι.
• Στο παγκάκι κάθεται το ζευγάρι μαζί.

These can sound more marked, poetic, or emphasis-driven depending on context.

For most learners, the original order is the safest and most natural:

• subject → verb → adverb → prepositional phrase

A rough pronunciation guide is:

to zev-GA-ri KA-the-te ma-ZI sto pan-GA-ki

A few helpful notes:

• ζ sounds like the z in zoo
• ευ in ζευγάρι is pronounced like ev here
• θ in κάθεται sounds like th in think
• The stress falls on:
  • ζευγάρι
  • κάθεται
  • μαζί
  • παγκάκι

If you want to sound natural, keep the rhythm smooth:

Το ζευγάρι κάθεται μαζί στο παγκάκι.

Because there are two different nouns, and both are definite:

• το ζευγάρι = the couple
• το παγκάκι inside στο παγκάκι = the bench

Greek uses the definite article very regularly, and each noun gets its own article. Since both nouns are neuter singular, both use το.

So the sentence literally has:

• the couple
• on the bench

That is completely normal in Greek.