Nemoj me prekinuti.

• Nemoj = don’t when used in this kind of command
• me = me
• prekinuti = to interrupt

So the structure is literally something like don’t + me + interrupt.

In Croatian, a very common way to make a negative command is:

nemoj + infinitive

So:

• Nemoj prekinuti = Don’t interrupt
• Nemoj kasniti = Don’t be late
• Nemoj zaboraviti = Don’t forget

Here, nemoj is the singular, informal form, used when speaking to one person you address as ti.

Because me is the unstressed object form of ja.

• ja = I
• me / mene = me

In this sentence, the verb prekinuti takes a direct object, so Croatian uses the accusative form. The short, unstressed version is me, and that is the normal choice here.

So:

• Nemoj me prekinuti = normal
• Nemoj mene prekinuti = possible, but more emphatic, like Don’t interrupt me (not someone else)

Because after nemoj, Croatian commonly uses the infinitive.

So the pattern is:

nemoj + infinitive

Examples:

• Nemoj ići. = Don’t go.
• Nemoj govoriti. = Don’t speak.
• Nemoj me prekinuti. = Don’t interrupt me.

That is why you do not get an imperative form after nemoj here.

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

• prekinuti = perfective
• prekidati = imperfective

Very roughly:

• prekinuti focuses on a single completed interruption
• prekidati focuses on the ongoing or repeated action of interrupting

So:

• Nemoj me prekinuti. = Don’t interrupt me.
• Ne prekidaj me. = Don’t keep interrupting me / Don’t interrupt me.

In real life, both can translate as Don’t interrupt me, but the aspect gives a slightly different feel.

Yes, but that is normal in Croatian.

Croatian often leaves out subject pronouns when they are understood from the verb form or the situation. In a command, the person being addressed is usually obvious.

Here, nemoj already tells you this is directed at you (singular, informal), so there is no need to say ti.

The normal order is:

Nemoj me prekinuti.

The short pronoun me is a clitic, which means it likes to stay near the beginning of the sentence, usually after the first stressed word.

So:

• Nemoj me prekinuti. = natural
• Nemoj prekinuti me. = unnatural in standard Croatian

If you use mene instead of me, then different word orders are possible, but they sound more emphatic:

• Nemoj mene prekinuti.

Use nemojte instead of nemoj:

• Nemojte me prekinuti. = Don’t interrupt me.

So:

• nemoj = singular informal
• nemojte = plural or formal

There is also:

• nemojmo = let’s not

For example:

• Nemojmo ga prekidati. = Let’s not interrupt him.

It is direct, but not automatically rude. The tone depends a lot on context and voice.

• said calmly: it can just mean Please don’t interrupt me
• said sharply: it can sound annoyed

If you want to make it softer, you can add polite words:

• Molim te, nemoj me prekinuti. = Please don’t interrupt me.
• Molim vas, nemojte me prekinuti. = Please don’t interrupt me.

A simple English-friendly guide:

• Nemoj ≈ NEH-moy
• me ≈ meh
• prekinuti ≈ preh-kee-NOO-tee

A few useful pronunciation points:

• Croatian j sounds like English y
• Croatian r is usually trilled or tapped
• stress can vary by dialect and standard pronunciation rules, but the guide above will be understood well

So the whole sentence is approximately:

NEH-moy meh preh-kee-NOO-tee