Sutra popodne bit ću slobodna, pa se možemo odmarati u parku.

Both are possible in Croatian, but the word order changes the form.

Future tense is made with:

• the infinitive: biti
• the clitic auxiliary: ću

So you can say:

• Sutra ću biti slobodna.
• Sutra popodne bit ću slobodna.

When the infinitive biti comes before ću, it usually loses its final -i, so biti + ću becomes bit ću.

So:

• ću biti = auxiliary first
• bit ću = infinitive first, with shortened infinitive form

Both mean the same thing here.

Because slobodna agrees with the speaker’s gender.

Croatian adjectives change for gender:

• slobodan = masculine
• slobodna = feminine
• slobodno = neuter

In this sentence, the speaker is female, so she says:

• bit ću slobodna

A male speaker would say:

• bit ću slobodan

Croatian often leaves subject pronouns out because the verb ending already shows who is doing the action.

Here:

• bit ću = I will be
• možemo = we can

So Croatian does not need:

• ja for I
• mi for we

You could add them for emphasis:

• Ja ću biti slobodna, pa se mi možemo odmarati u parku.

But in normal speech, that would usually sound unnecessary unless you want contrast or emphasis.

Sutra popodne means tomorrow afternoon.

Croatian often uses bare time expressions without a preposition, especially with common words like:

• danas = today
• sutra = tomorrow
• ujutro = in the morning
• popodne = in the afternoon
• večeras = this evening / tonight

So sutra popodne is a natural time phrase, just like English tomorrow afternoon.

You do not need something like u here.

No. You may also see poslijepodne.

Both can mean afternoon:

• popodne
• poslijepodne

Popodne is very common in everyday language.
Poslijepodne is also standard and may sound a bit fuller or more formal depending on the speaker and region.

So you could also say:

• Sutra poslijepodne bit ću slobodna...

Here pa connects the two parts of the sentence and means something like:

• so
• and so
• then

The idea is:

• Tomorrow afternoon I’ll be free, so we can relax in the park.

It often links one fact to a natural result or next step.

It is very common in everyday Croatian and often sounds more conversational than a more explicit word like zato.

The verb is odmarati se, which means to rest / relax. The se is part of the verb.

In Croatian, short unstressed words like se often appear very early in the clause. After pa, the natural standard order is:

• pa se možemo odmarati

Without pa, you would very naturally say:

• Možemo se odmarati u parku.

So:

• možemo se odmarati is normal in a simple clause
• pa se možemo odmarati is normal after pa

Not really in the full English sense.

In many Croatian verbs, se is simply part of the verb’s normal form. With odmarati se, it does not strongly mean ourselves every time you use it. It is just how the verb is commonly used.

So:

• odmarati by itself can mean something like to give rest in some contexts
• odmarati se means to rest / relax

For a learner, it is best to memorize odmarati se as a whole verb.

This is about aspect, which is very important in Croatian.

• odmarati se = imperfective, ongoing or repeated resting/relaxing
• odmoriti se = perfective, to rest and complete that rest

In this sentence, the idea is a stretch of time spent relaxing in the park, so the imperfective odmarati se fits well.

Compare:

• Možemo se odmarati u parku. = We can relax / spend time relaxing in the park.
• Možemo se odmoriti u parku. = We can take a rest in the park / rest up there.

Both are possible in different contexts, but odmarati se emphasizes the activity as ongoing.

It is u parku because the sentence describes a location, not movement.

With u:

• u + accusative often means movement into something
• u + locative means being in a place

Here the meaning is relax in the park, so it is location:

• u parku = in the park

The noun park is in the locative singular:

• nominative: park
• locative: parku

Compare:

• Odmaramo se u parku. = We are relaxing in the park.
• Idemo u park. = We are going to the park.

Because pa here joins two separate clauses, each with its own finite verb:

• bit ću
• možemo

So the sentence has two full parts:

• Sutra popodne bit ću slobodna
• pa se možemo odmarati u parku

In Croatian, when pa links two independent clauses like this, a comma is normally used.

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

Possible alternatives include:

• Sutra popodne ću biti slobodna, pa se možemo odmarati u parku.
• Bit ću slobodna sutra popodne, pa se možemo odmarati u parku.
• Sutra popodne bit ću slobodna, pa možemo se odmarati u parku.

The first one is especially natural.

The original sentence sounds good and natural, but Croatian often allows several word orders depending on rhythm, emphasis, and style.