Η εστίαση είναι σωστή.

A natural pronunciation is roughly:

ee es-TEE-a-see EE-ne so-STEE

More carefully, with stress marked:

• Η = ee
• εστίαση = es-TEE-a-see
• είναι = EE-ne
• σωστή = so-STEE

A more IPA-style version would be approximately: i esˈtiasi ˈine sosˈti

The written accents show you where the stress goes:

• εστίαση
• είναι
• σωστή

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

Greek articles change according to gender, number, and case. In this sentence:

• η = the for a feminine singular noun in the nominative case

It matches εστίαση, which is a feminine singular noun.

In Greek, every noun has a grammatical gender: masculine, feminine, or neuter.
Εστίαση is simply a feminine noun.

Many nouns ending in -ση are feminine, so this pattern is very common:

• η χρήση = the use
• η λύση = the solution
• η ερώτηση = the question
• η εστίαση = the focus / focusing

This is grammatical gender, so it does not mean the thing itself is biologically female.

Είναι is the verb to be in the present tense.

It can mean:

• is
• are

depending on the subject.

In this sentence, the subject is singular (η εστίαση), so είναι means is.

A useful thing to know is that είναι does not change for different persons in the same way English am / is / are does. For example:

• είμαι = I am
• είσαι = you are
• είναι = he/she/it is, and also they are

Because the adjective has to agree with the noun it describes.

Since εστίαση is:

• feminine
• singular
• nominative

the adjective must also be:

• feminine
• singular
• nominative

So:

• σωστός = masculine singular
• σωστή = feminine singular
• σωστό = neuter singular

That is why the sentence uses σωστή.

Because σωστή is being used as a predicate adjective after the verb είναι.

In English, compare:

• The focus is correct.

You do not say:

• The focus is the correct.

Greek works similarly here:

• Η εστίαση είναι σωστή. = The focus is correct.

If you added an article before σωστή, it would change the structure and meaning.

No, Greek word order is often more flexible than English, because the endings help show the grammatical relationships.

The neutral, straightforward order is:

• Η εστίαση είναι σωστή.

But other orders are possible for emphasis, for example:

• Σωστή είναι η εστίαση. = It is the focus that is correct / The focus is correct.
• Είναι σωστή η εστίαση. = The focus is correct.

These alternatives may sound more marked or context-dependent. For a learner, the original order is the safest default.

Yes. Εστίαση can have different meanings depending on context.

Common meanings include:

• focus or focusing (for example in photography, optics, or attention)
• in some contexts, catering or the food-service sector

So the exact sense depends on where you saw the sentence.
For example:

• in a camera/manual context, it may mean The focus is correct
• in a business context, εστίαση can refer to the restaurant/catering field

The grammar of the sentence stays the same either way.

Normally, you would keep the article here: Η εστίαση είναι σωστή.

Greek uses the definite article much more regularly than English.
Without the article, Εστίαση είναι σωστή would usually sound unnatural or incomplete in standard everyday Greek.

So for learners, the natural form is:

• Η εστίαση είναι σωστή.

You add δεν before the verb:

• Η εστίαση δεν είναι σωστή. = The focus is not correct.

This is the normal way to negate a sentence with είναι.

The subject is Η εστίαση.

You can identify it because:

• it is the thing being talked about
• it is in the nominative form
• the adjective σωστή agrees with it

So the structure is:

• Η εστίαση = subject
• είναι = verb
• σωστή = predicate adjective

Yes, they do.

Greek accent marks show which syllable is stressed, and stress is important for correct pronunciation.

In this sentence:

• εστίαση → stress on -τί-
• είναι → stress on εί-
• σωστή → stress on the last syllable

If you ignore accents, people may still understand you in writing, but it is important to learn them because they are part of correct spelling and pronunciation.

In standard Modern Greek, no. You normally keep είναι in a sentence like this.

So:

• Η εστίαση είναι σωστή. = correct
• Η εστίαση σωστή. = not standard as a normal complete sentence

In very informal notes, headlines, or special stylistic contexts, parts of sentences may be omitted, but for normal grammar, keep είναι.

The main thing that would change is the article and the adjective ending.

For example:

Masculine:

• Ο φακός είναι σωστός. = The lens is correct.

Feminine:

• Η εστίαση είναι σωστή.

Neuter:

• Το αποτέλεσμα είναι σωστό. = The result is correct.

So this sentence is a good example of adjective agreement in Greek:

• ο ... σωστός
• η ... σωστή
• το ... σωστό