Δεν ξέρω αν συμφέρει να πάμε σήμερα στο κέντρο, γιατί έχει πολλή κίνηση και είμαι ήδη κουρασμένος.

Δεν ξέρω means I don’t know.

• δεν = the negation particle not
• ξέρω = I know

Greek usually puts δεν directly before the verb, so Δεν ξέρω is the normal way to say I don’t know.

Here αν means whether / if in an indirect-question sense:

• Δεν ξέρω αν... = I don’t know whether...

This is very common in Greek after verbs like ξέρω (know), ρωτάω (ask), βλέπω (see) when English would use if or whether.

In this sentence, it does not mean a condition like if this happens, then.... It means whether it is worth going.

συμφέρει comes from συμφέρω and here it means something like:

• it is worth it
• it is convenient
• it makes sense
• it is advantageous

So Δεν ξέρω αν συμφέρει... means I don’t know if it’s worth it / if it makes sense...

It is often used impersonally in Greek, with the idea it is beneficial/useful/practical rather than someone benefits.

After συμφέρει, Greek commonly uses να + verb to express the action that may or may not be worth doing.

So:

• συμφέρει να πάμε = it’s worth going / it makes sense for us to go

The structure is:

• συμφέρει
  • να
    • verb

This is extremely common in Greek:

• Συμφέρει να περιμένουμε. = It’s worth waiting.
• Δεν συμφέρει να φύγουμε τώρα. = It’s not worth leaving now.

να πάμε is the aorist subjunctive form of πάω (to go), and here it refers to one whole action/event: to go today to the center.

Greek often uses the aorist subjunctive after να when talking about a single completed action, not an ongoing or repeated one.

So:

• να πάμε = to go / for us to go as one event
• να πηγαίνουμε would sound more like to be going regularly / repeatedly / as an ongoing activity

In this sentence, the speaker is talking about one possible trip today, so να πάμε is the natural choice.

Greek verb forms can serve different functions depending on context.

πάμε can mean:

• we go in some contexts
• let’s go
• after να, for us to go

Here it is part of να πάμε, so it means for us to go.

That is because να marks the subjunctive, and the exact English translation depends on the sentence:

• Θέλω να πάμε. = I want us to go.
• Μπορούμε να πάμε. = We can go.
• Συμφέρει να πάμε. = It’s worth going / for us to go.

στο is a contraction of σε + το:

• σε = to / in / at
• το = the
• στο = to the / in the / at the

So:

• στο κέντρο = to the center / downtown / into town center

In many real-life contexts, το κέντρο often means the city center / downtown.

Greek very commonly contracts σε + article:

• στο = σε το
• στη = σε τη(ν)
• στον = σε τον

σήμερα means today, and its position is quite natural here:

• να πάμε σήμερα στο κέντρο

This means to go to the center today.

Greek word order is fairly flexible, so you could move σήμερα for emphasis, but the original order is neutral and natural. For example:

• να πάμε σήμερα στο κέντρο = neutral
• σήμερα να πάμε στο κέντρο = stronger focus on today
• να πάμε στο κέντρο σήμερα = also possible

The original sentence sounds like normal everyday Greek.

γιατί can mean both:

• why?
• because

The meaning depends on context.

Here it clearly means because, since it introduces the reason:

• ..., γιατί έχει πολλή κίνηση...
• ..., because there is a lot of traffic...

If it were a question, the intonation and context would be different:

• Γιατί πάμε στο κέντρο; = Why are we going downtown?

Literally, it means it has a lot of movement/traffic, but the natural English meaning is:

• there is a lot of traffic

In Greek, έχει is often used the way English uses there is / there are in everyday speech.

So:

• Έχει κόσμο. = There are a lot of people.
• Έχει φασαρία. = There’s noise.
• Έχει πολλή κίνηση. = There’s a lot of traffic.

Because κίνηση is a feminine singular noun, and the adjective must agree with it.

• πολλή = feminine singular
• κίνηση = feminine singular

So:

• πολλή κίνηση = a lot of traffic

Compare:

• πολύ νερό = a lot of water (νερό is neuter)
• πολλός κόσμος = a lot of people / a big crowd (κόσμος is masculine)
• πολλή δουλειά = a lot of work (δουλειά is feminine)

Also, the spelling matters:

• πολύ can be the adverb very or the neuter form
• πολλή is the feminine adjective form used here

είμαι means I am, and κουρασμένος means tired.

• είμαι ήδη κουρασμένος = I’m already tired

The word κουρασμένος is a participle/adjectival form and agrees with the speaker’s gender:

• male speaker: κουρασμένος
• female speaker: κουρασμένη

So if a woman were speaking, she would say:

• είμαι ήδη κουρασμένη

ήδη means already.

So:

• είμαι ήδη κουρασμένος = I’m already tired

It adds the idea that the speaker is tired even before going, which helps explain why going to the center may not be a good idea.

Greek usually leaves subject pronouns out because the verb ending already shows the person.

For example:

• ξέρω = I know
• πάμε = we go / we should go / for us to go
• είμαι = I am

So Greek does not need to say:

• Εγώ δεν ξέρω...
• ...να πάμε εμείς...
• ...και εγώ είμαι...

Those pronouns can be added, but only for emphasis or contrast.

Yes. Greek often allows several natural English translations.

Possible translations include:

• I don’t know if it’s worth going downtown today, because there’s a lot of traffic and I’m already tired.
• I’m not sure whether it makes sense to go to the city center today, because there’s a lot of traffic and I’m already tired.
• I don’t know whether it’s a good idea to go downtown today, because traffic is heavy and I’m already tired.

All of these reflect the Greek sentence well. The key idea is uncertainty about whether going is practical or worthwhile.