Το κατάστημα είναι κλειστό· επομένως φεύγω.

Κατάστημα is a neuter noun, so it takes the neuter singular article το.

A very useful pattern is that many Greek nouns ending in -μα are neuter, for example:

• το κατάστημα = the shop/store
• το όνομα = the name
• το πρόβλημα = the problem

In this sentence, το κατάστημα is the subject of είναι κλειστό.

Because κλειστό has to agree with κατάστημα.

Greek adjectives change form to match the noun’s:

• gender
• number
• usually case

Since κατάστημα is neuter singular, the adjective must also be neuter singular:

• κλειστός = masculine
• κλειστή = feminine
• κλειστό = neuter

So:

• το κατάστημα είναι κλειστό

but:

• ο δρόμος είναι κλειστός = the road is closed
• η πόρτα είναι κλειστή = the door is closed

Because κλειστό is a predicate adjective here, not part of the noun phrase.

Compare these two patterns:

• το κλειστό κατάστημα = the closed shop
  Here κλειστό directly describes the noun inside the noun phrase.

• το κατάστημα είναι κλειστό = the shop is closed
  Here κλειστό comes after είναι and tells you the state of the shop.

So after είμαι, Greek normally uses the adjective without an article.

In modern Greek, you can treat κλειστό as an adjective meaning closed.

Historically, it comes from the verb κλείνω = to close, so it is related to a participial form. But for learners, the important thing is that it behaves like an adjective:

• it agrees with the noun
• it can be used after είμαι
• it can also be used before a noun

For example:

• η πόρτα είναι κλειστή
• η κλειστή πόρτα

Είναι is the 3rd person singular form of είμαι = to be.

So in this sentence it simply means is:

• Το κατάστημα είναι κλειστό = The shop is closed

This is a very common Greek structure:

• είμαι + adjective

For example:

• Είμαι έτοιμος = I am ready
• Το φαγητό είναι ζεστό = The food is warm
• Η πόρτα είναι ανοιχτή = The door is open

That mark is the Greek άνω τελεία.

In modern Greek, it is used roughly like an English semicolon or sometimes like a colon, linking closely related parts of a sentence.

So here:

• Το κατάστημα είναι κλειστό· επομένως φεύγω.

means the first clause leads logically to the second.

A very important thing for English speakers: in Greek, the symbol ; is not a semicolon in the English sense. It is used as a question mark.

So Greek punctuation works differently:

• ; = question mark
• · = semicolon/colon-like pause

Επομένως is a connector/adverb meaning therefore, so, or consequently.

It links the second clause to the first and shows a logical result:

• The shop is closed; therefore I’m leaving.

It is somewhat formal or neutral in tone. You will often see it in writing, explanations, or more careful speech.

Yes, but it sounds a bit more formal or bookish than some everyday alternatives.

In casual speech, Greeks often prefer things like:

• οπότε = so
• γι’ αυτό = for that reason / that’s why

So these would sound more conversational:

• Το κατάστημα είναι κλειστό, οπότε φεύγω.
• Το κατάστημα είναι κλειστό, γι’ αυτό φεύγω.

Your original sentence is perfectly correct; it just has a slightly more formal written feel.

Because the verb ending already tells you the subject.

Φεύγω is 1st person singular, so it already means I leave / I am leaving. Greek often leaves out subject pronouns unless they are needed for emphasis or contrast.

So:

• φεύγω = I leave / I’m leaving

If you say:

• εγώ φεύγω

that usually adds emphasis, something like:

• I’m the one leaving
• I’m leaving
• as for me, I’m leaving

It can mean all of those, depending on context.

Greek present tense often covers both:

• a simple present meaning
• and a progressive meaning

So φεύγω can be translated as:

• I leave
• I am leaving
• I’m going away

In this sentence, because it is the result of the first clause, English will often translate it naturally as:

• therefore I’m leaving
• or so I’m leaving

If you wanted to make the idea of right now even clearer, Greek could add τώρα:

• επομένως φεύγω τώρα

But it is not necessary.

Yes, Greek word order is more flexible than English, although some versions sound more natural than others.

Your sentence is natural as written:

• Το κατάστημα είναι κλειστό· επομένως φεύγω.

You could also write:

• Το κατάστημα είναι κλειστό, επομένως φεύγω.
• Επομένως, φεύγω.
  if the reason is already understood from context

Greek often moves words around for emphasis, rhythm, or style. But in a simple learner sentence, the original order is clear and standard.

Yes. Both can mean shop/store, but they differ a little in tone.

• κατάστημα = more neutral, formal, or official
• μαγαζί = more everyday and conversational

So:

• Το κατάστημα είναι κλειστό· επομένως φεύγω.
  sounds a bit more formal

while:

• Το μαγαζί είναι κλειστό, οπότε φεύγω.
  sounds more casual and spoken

Both are correct; the choice depends on style.