Nastavićemo sutra.

Because nastavićemo is the 1st person plural future form of the verb nastaviti (to continue).

• nastaviti = to continue
• mi = we
• nastavićemo = we will continue

In Serbian, the subject pronoun mi is often omitted because the verb ending already shows who is doing the action.

This is the future I tense.

It is made from:

• the verb stem: nastavi-
• plus the future auxiliary ending for we: -ćemo

So:

• nastaviti → nastavi-
• ćemo = we will
• nastavićemo = we will continue

A learner will also often see the analytic version:

• Mi ćemo nastaviti sutra.

That means the same thing.

In standard Serbian, forms like this are commonly written as one word when the future auxiliary is attached to the infinitive stem:

• nastavićemo
• uradiću
• videćeš

So nastavićemo is not a random spelling choice; it is a normal future-tense form in Serbian.

You may also meet the separated version in closely related standards, especially Croatian-style writing:

• nastavit ćemo

But for standard Serbian, nastavićemo is the expected form.

Serbian usually drops subject pronouns when they are not needed.

The ending -ćemo already tells you the subject is we, so mi is unnecessary unless you want emphasis.

Natural:

• Nastavićemo sutra.

Also possible, with emphasis:

• Mi ćemo nastaviti sutra. = We will continue tomorrow.

But Mi nastavićemo sutra is not the most natural standard way to say it.

Sutra means tomorrow.

In Serbian, words like danas (today), sutra (tomorrow), and juče (yesterday) often stand without a preposition.

So:

• Nastavićemo sutra. = We will continue tomorrow.

You do not need something like on or at before sutra.

Yes. Serbian word order is fairly flexible.

These are all possible, depending on emphasis:

• Nastavićemo sutra.
• Sutra ćemo nastaviti.
• Mi ćemo nastaviti sutra.

The meaning stays basically the same, but the focus changes a little:

• Nastavićemo sutra. → neutral
• Sutra ćemo nastaviti. → emphasis on tomorrow
• Mi ćemo nastaviti sutra. → emphasis on we

Yes, it matters.

Nastaviti is generally treated as a perfective verb in this kind of use, meaning it refers to a completed or definite action of continuing / resuming.

Its imperfective partner is usually nastavljati.

So:

• nastaviti → to continue / resume (as a definite event)
• nastavljati → to be continuing / to continue repeatedly or over time

In a sentence like Nastavićemo sutra, the perfective verb is very natural because it means we’ll continue/resume tomorrow as a specific next action.

The letter ć is a soft Serbian consonant, somewhat like a very soft ty sound.

So nastavićemo is approximately:

• na-sta-VI-che-mo

But the ć is softer than English ch in cheese.

Also:

• č and ć are different letters in Serbian
• ć is softer
• č is harder

That distinction matters in pronunciation and spelling.

Yes, but it is not exactly the same.

• Nastavićemo sutra = We will continue tomorrow / We’ll resume tomorrow
• Nastavljaćemo sutra = We will be continuing tomorrow or we’ll continue repeatedly/over a period

So nastavićemo sounds more like a single future action or decision to resume, while nastavljaćemo is more ongoing or repeated in feel.

In most everyday situations for We’ll continue tomorrow, Nastavićemo sutra is the more natural choice.

Yes. Ću, ćeš, će, ćemo, ćete, će are the future auxiliary forms in Serbian.

Here is the full set:

• ja ću = I will
• ti ćeš = you will
• on/ona/ono će = he/she/it will
• mi ćemo = we will
• vi ćete = you will
• oni/one/ona će = they will

So in nastavićemo, the -ćemo part tells you the subject is we.