Η κοπέλα δίπλα μου δεν είναι φλύαρη, αλλά χαμογελάει πάντα.

Η is the feminine singular definite article, so it means the.

It agrees with κοπέλα because κοπέλα is a feminine singular noun. Greek articles change for gender, number, and case, unlike English the, which stays the same.

So:

• η κοπέλα = the girl

Yes. Κοπέλα is a feminine noun, and that affects words that go with it.

In this sentence, you can see that in:

• η κοπέλα — the article is feminine
• φλύαρη — the adjective is also feminine

Greek adjectives must agree with the noun they describe or refer to. So because the subject is feminine, the adjective is feminine too.

Δίπλα means beside / next to, and μου means me / my depending on context.

Here, μου works with δίπλα to mean:

• δίπλα μου = next to me / beside me

A very literal way to think of it is beside me.

This is a very common Greek structure. You will also see similar phrases like:

• μπροστά μου = in front of me
• πίσω μου = behind me
• κοντά μου = near me

Because in Greek, weak pronouns like μου normally come after words such as δίπλα.

So Greek says:

• δίπλα μου

not:

• μου δίπλα

This is just the normal Greek pattern. English speakers often expect the pronoun to come earlier, but Greek places it after the word it depends on here.

You may also hear a fuller version:

• δίπλα σε μένα

That also means next to me, but δίπλα μου is shorter and very common.

Δεν is the normal word for not in ordinary statements.

So:

• δεν είναι = is not

Greek usually puts δεν directly before the verb. That is what happens here:

• δεν είναι φλύαρη

English uses not after a form of be, but Greek puts the negative particle before the verb.

Because Greek often leaves out subject pronouns when they are not needed. This is very common.

The subject is already clear from the noun phrase:

• Η κοπέλα ...

So Greek does not need to repeat she.

If you added αυτή, it would usually sound more emphatic, like she in a contrastive sense.

Also, Greek verbs do not show gender. The verb form is the same for:

• he is
• she is
• it is

So είναι can mean he is, she is, or it is, depending on context.

Because φλύαρη is the feminine singular form of the adjective, and it must agree with η κοπέλα.

A common set of forms is:

• φλύαρος = masculine
• φλύαρη = feminine
• φλύαρο = neuter

Since the subject is feminine, Greek uses:

• Η κοπέλα ... δεν είναι φλύαρη

Even though the adjective comes after είναι, it still agrees with the subject.

Αλλά means but. It connects two contrasting ideas:

• she is not talkative
• but she always smiles

The comma before αλλά is normal Greek punctuation, just as English often uses a comma before but when joining two clauses.

So the structure is:

• statement 1 + comma + αλλά
  • statement 2

Yes. Χαμογελάει is a normal 3rd person singular present form meaning smiles / is smiling, and χαμογελά is also commonly used.

So both can work:

• χαμογελάει
• χαμογελά

In standard Modern Greek, many verbs of this type have both a longer and a shorter present-tense form in everyday use.

Here, χαμογελάει πάντα is completely natural.

Πάντα means always, and Greek adverbs are often fairly flexible in position.

So these are all possible, with slightly different emphasis:

• χαμογελάει πάντα
• πάντα χαμογελάει
• χαμογελάει πάντοτε (more formal/literary with πάντοτε)

In this sentence, putting πάντα at the end sounds natural and smooth. It highlights the idea of always as the final piece of information.

Είναι is pronounced roughly EE-ne.

A useful breakdown is:

• εί = ee
• ναι here is pronounced ne, not like the English word nay

So the whole word is:

• είναι → EE-ne

This is the present tense of to be, and είναι is the standard 3rd person singular form.

A rough pronunciation guide is:

• Η κοπέλα δίπλα μου δεν είναι φλύαρη, αλλά χαμογελάει πάντα.
• ee ko-PE-la THEE-pla moo then EE-ne FLEE-a-ree, a-LA ha-mo-ghe-LA-ee PAN-da

A few important notes:

• The accent mark shows the stressed syllable: κοπέλα, δίπλα, είναι, αλλά, χαμογελάει, πάντα
• δ sounds like the th in this
• χ in χαμογελάει is a throaty sound, not like English h
• γ before ε is a soft sound, somewhat like y in some pronunciations, so γε is not a hard g

You do not need perfect pronunciation immediately, but noticing the stress patterns early is very helpful.