Αν σήμερα δεν δουλεύω, κάνω βόλτα στο πάρκο.

Greek normally leaves out subject pronouns like εγώ (I) when the subject is clear from the verb ending.

• δουλεύω = I work
• κάνω = I do / I make

The -ω ending on both verbs tells you the subject is I, so εγώ would be redundant:

• Αν σήμερα δεν δουλεύω, κάνω βόλτα στο πάρκο.
  = If today I’m not working, I take a walk in the park.

You can say Εγώ αν σήμερα δεν δουλεύω… for emphasis, but it’s not needed.

Greek present tense often covers:

1. Right now / general present

   • If today I’m not working (today as a general frame), I take a walk…

2. Near future, when the time is clear from context

   • If I’m not working today (later today), I’ll take a walk…

English often uses will in this kind of conditional, but Greek can stay in the present when the meaning is clear:

• Αν σήμερα δεν δουλεύω, κάνω βόλτα στο πάρκο.
  → could be understood as: If I’m not working today, I (will) go for a walk in the park.

If you want to make the “future” sense very explicit, you can say:

• Αν σήμερα δεν δουλέψω, θα κάνω βόλτα στο πάρκο.
  (If I don’t work today, I’ll take a walk in the park.)

αν is the usual word for if in conditional sentences.

• Αν σήμερα δεν δουλεύω… = If I’m not working today…

It can sometimes overlap with when in English, but structurally it is if. When Greek wants to say “when” in a time sense, it typically uses:

• όταν = when

Example contrast:

• Αν δεν δουλεύω, κάνω βόλτα. – If I’m not working, I take a walk.
• Όταν δεν δουλεύω, κάνω βόλτα. – When I’m not working, I (usually) take a walk.

Greek normally uses a comma to separate the if-clause from the main clause:

• Αν σήμερα δεν δουλεύω, κάνω βόλτα στο πάρκο.

This is natural punctuation whenever you have a dependent clause (introduced by αν) followed by a main clause. It’s similar to English:

• If today I’m not working, I take a walk in the park.

δεν is the standard negative particle for verbs in Greek. It always comes directly before the verb it negates:

• δουλεύω – I work
• δεν δουλεύω – I do not work / I’m not working

In this sentence:

• Αν σήμερα δεν δουλεύω…
  → If today I am not working…

Note:

• δεν is used for statements and questions.
• μη(ν) is used for negative commands and in some subjunctive/other structures, not here.

Both δε and δεν represent the same word in modern Greek.

• δεν is the full, standard form.
• δε is a colloquial/shortened form, often in informal writing or speech.

Before a consonant like δ in δουλεύω, both forms are possible in informal contexts:

• δεν δουλεύω (standard, always correct)
• δε δουλεύω (colloquial)

In careful writing and in textbooks, you’ll usually see δεν.

Literally:

• κάνω = I do / I make
• βόλτα = a walk, a stroll, an outing

So κάνω βόλτα literally is “I do a walk / outing”, but idiomatically it means:

• I go for a walk / I take a walk / I go for a stroll.

It’s a very common expression. A few related examples:

• Θέλεις να κάνουμε μια βόλτα;
  Do you want us to go for a walk?
• Πάω μια βόλτα.
  I’m going for a walk. (Another very common way to say it.)

In your sentence:

• κάνω βόλτα στο πάρκο = I go for a walk in the park.

στο is a contraction of:

• σε (in / at / to) + το (the, neuter singular)

So:

• σε το πάρκο → στο πάρκο

This contraction is obligatory in normal speech and writing. A few similar contractions:

• σε + τον → στον (στον δρόμο – in/on the road)
• σε + την → στη(ν) (στην πόλη – in the city)
• σε + τα → στα (στα πάρκα – in the parks)

Here:

• στο πάρκο = in the park / to the park, depending on context.
  In this sentence, it’s naturally understood as in the park.

στο πάρκο uses the definite article (the), and in Greek that’s normal when you mean a specific or known place:

• στο πάρκο → at/in the (specific) park

Using σε πάρκο (without the article) would mean “in a park”, which is possible but less typical here unless you really want to emphasize any park, not a particular one.

Greek generally uses definite articles more often than English, especially with places:

• Πάω στο σχολείο. – I’m going to (the) school.
• Πάμε στο σινεμά. – We’re going to the cinema.

πάρκο is:

• Gender: neuter
• Singular nominative/accusative form: το πάρκο
• Plural nominative/accusative: τα πάρκα

In στο πάρκο, the noun is in the accusative after the preposition σε, and the article το is built into στο:

• σε + το πάρκο → στο πάρκο

Word order in Greek is relatively flexible, especially for adverbs like σήμερα (today). All of these are possible:

• Αν σήμερα δεν δουλεύω, κάνω βόλτα στο πάρκο.
• Αν δεν δουλεύω σήμερα, κάνω βόλτα στο πάρκο.

Both mean essentially the same: If I’m not working today…
The first puts a bit more emphasis on “today” at the start; the second is more neutral.

You can’t move δεν away from the verb, though: it must stay right before δουλεύω.

Greek negation and continuous meaning are handled differently:

1. Negation
   Greek does not add a verb like “do” for negation. It just uses δεν before the verb:

   • δουλεύω – I work / I’m working
   • δεν δουλεύω – I don’t work / I’m not working

2. Continuous vs simple
   Greek does not have a separate continuous form like English am working. The present tense covers both:

   • δουλεύω can mean I work (in general) or I’m working (right now), depending on context.

So Αν σήμερα δεν δουλεύω… can be understood as either:

• If I don’t work today…
• If I’m not working today…

Approximate pronunciation (stress in ALL CAPS):

• Αν – an (like “un” in “under,” short)
• σήμερα – SEE-me-ra
• δεν – then (like “then” in English, with the th of “this”)
• δουλεύω – thoo-LEH-vo
• κάνω – KAH-no
• βόλτα – VOL-ta (O as in “not”)
• στο – sto
• πάρκο – PAR-ko

Full sentence:

• Αν ΣΗ-με-ρα δΕΝ δου-ΛΕ-vo, ΚΑ-no VOL-ta sto PAR-ko.

Note: Greek δ is a voiced th sound, like in English this, not like English d in do.