Το ντουέτο αρχίζει με το κουπλέ και τελειώνει με το ρεφρέν.

Το is the definite article meaning the for neuter singular nouns.

In this sentence, you have three neuter singular nouns:

• το ντουέτο = the duet
• το κουπλέ = the verse
• το ρεφρέν = the refrain / chorus

Greek usually repeats the article where English might also use the, so:

• με το κουπλέ = with the verse
• με το ρεφρέν = with the refrain

So the article is not optional here just because it already appeared once earlier in the sentence.

They are treated as neuter nouns in Greek. This is very common with:

• loanwords
• nouns ending in -ο
• some foreign musical and technical terms

So:

• το ντουέτο
• το κουπλέ
• το ρεφρέν

Even though κουπλέ and ρεφρέν do not have the typical Greek-looking endings, Greek still assigns them a grammatical gender, and here that gender is neuter.

Both are present tense, third person singular forms.

• αρχίζει = begins / is beginning
• τελειώνει = ends / is ending

They match the subject το ντουέτο, which is singular:

• The duet begins...
• The duet ends...

Greek often uses the present tense in the same kinds of situations English does.

Because Greek does not usually need subject pronouns when they are clear from the verb form.

In English, you must say:

• It begins
• It ends

In Greek, the verb ending already tells you it is third person singular, so once the subject το ντουέτο has been stated, there is no need to add a separate word for it.

So Greek naturally says:

• Το ντουέτο αρχίζει...
• και τελειώνει...

The subject is understood to remain the same.

Με usually means with, and in this sentence it introduces what the duet starts and ends with:

• αρχίζει με το κουπλέ = begins with the verse
• τελειώνει με το ρεφρέν = ends with the refrain

This is a normal Greek pattern. English uses with the same way here, so it matches quite neatly.

Also, after με, the noun appears in the form used after prepositions. For these particular words, the form looks the same as the basic dictionary form, especially because they are neuter singular.

Και means and.

It connects the two verb phrases:

• αρχίζει με το κουπλέ
• τελειώνει με το ρεφρέν

So the structure is:

• The duet begins with the verse and ends with the refrain.

Greek uses και very broadly, much like English and.

Greek word order is more flexible than English word order.

The version here is very natural and straightforward:

• Το ντουέτο αρχίζει με το κουπλέ και τελειώνει με το ρεφρέν.

But Greek could change the order for emphasis, for example:

• Με το κουπλέ αρχίζει το ντουέτο...
• Το ντουέτο με το κουπλέ αρχίζει... (less neutral, more marked)

Even though other orders are possible, the given sentence is the most neutral and learner-friendly one: subject + verb + phrase + και + verb + phrase

Because the same subject applies to both verbs.

Greek, like English, can avoid repeating the subject when it is clearly the same:

• The duet begins... and ends...
• Το ντουέτο αρχίζει... και τελειώνει...

Repeating το ντουέτο would usually sound unnecessary unless you wanted special emphasis.

They are borrowed words, especially common in musical vocabulary.

• κουπλέ comes from French couplet
• ρεφρέν comes from French refrain

Greek often adapts foreign musical terms and uses them naturally with Greek articles and grammar:

• το κουπλέ
• το ρεφρέν

So even though the words are borrowed, they behave like regular nouns in the sentence.

A rough pronunciation guide:

• αρχίζει ≈ ar-khee-ZEE
• τελειώνει ≈ teh-lee-OH-nee

A few helpful notes:

• χ in αρχίζει is not like English k; it is a rough sound, like the ch in German Bach.
• The accent mark shows where the stress goes:
  • αρχίζει
  • τελειώνει

Paying attention to stress is important in Greek because it is part of correct pronunciation.

Yes. τελειώνει is related to the idea of ending / finishing, and τέλος means end.

So there is a clear family resemblance:

• τέλος = end
• τελειώνω = to finish / to end
• τελειώνει = it finishes / it ends

Seeing these word families can make vocabulary easier to remember.

Yes. Αρχίζει can often be translated as either begins or starts, depending on the context.

Likewise:

• τελειώνει can be ends or finishes

So natural English translations could include:

• The duet starts with the verse and ends with the refrain.
• The duet begins with the verse and finishes with the refrain.

The Greek itself is neutral and works well with any of those natural English choices.