Slučajno smo se našli.

Because Serbian often drops subject pronouns when they are already clear from the verb.

Here, smo means we are / we have as the auxiliary for the past tense, so the sentence already tells you the subject is we.

You could say:

Mi smo se slučajno našli.

But mi is usually added only for emphasis, contrast, or clarity.

A rough word-by-word breakdown is:

• Slučajno = by chance / accidentally
• smo = we (auxiliary used in the past tense)
• se = reflexive particle
• našli = found / in this expression, met

So literally it looks something like:

By chance we found ourselves

But the natural meaning is:

We met by chance
or
We happened to meet

Yes, naći normally means to find.

But the reflexive form naći se is a very common expression, and one of its meanings is:

• to meet
• to end up somewhere
• to find oneself in a situation

So:

• Našli smo ključ. = We found the key.
• Našli smo se u gradu. = We met in town.
• Našao sam se u problemu. = I found myself in trouble.

In your sentence, našli smo se means we met.

Se is a reflexive particle, but in Serbian it is not always literally reflexive in the English sense.

In naći se, it is part of the verb expression. You should learn naći se as a unit.

So although English would not say we found ourselves in normal speech here, Serbian uses se naturally in this structure.

This is similar to how some verbs are just used with a reflexive marker in many European languages, even when English does not use one.

Because Serbian has fairly strict placement rules for short unstressed words called clitics.

Both smo and se are clitics, and they usually appear near the beginning of the sentence in a fixed order.

So:

• Slučajno smo se našli. = correct
• Slučajno se smo našli. = incorrect

At this level, it is best to memorize the pattern:

auxiliary + se + main verb

So:

• sam se našao
• si se našao is not used; instead našao si se
• smo se našli
• ste se našli

Clitic placement is an important topic in Serbian, but here smo se is the normal order.

This is the past tense.

Serbian past tense is usually formed with:

• the present tense of biti (to be) as an auxiliary
• plus the past participle

Here:

• smo = we have / we are (auxiliary)
• našli = past participle

So:

smo našli = we found / we met

With se, it becomes:

smo se našli = we met / we found ourselves

Because the past participle in Serbian agrees with the subject in gender and number.

For we, the form depends on who we refers to:

• našli = masculine plural, or a mixed-gender group
• našle = feminine plural

So:

• Slučajno smo se našli. = used for men or a mixed group
• Slučajno smo se našle. = used if the speakers are all female

This is one of the things English speakers often have to get used to, because English past forms do not change for gender.

No, they are related but not the same.

• naći se often means to meet, to meet up, or to run into each other
• upoznati se means to get acquainted / to meet for the first time

So:

• Slučajno smo se našli. = We met by chance / We ran into each other
• Upoznali smo se prošle godine. = We met each other last year (for the first time)

If two people already know each other and unexpectedly see each other somewhere, našli smo se is very natural.

Yes, it can move.

Slučajno is an adverb, and Serbian word order is fairly flexible. The beginning position often gives it a little prominence.

Possible versions:

• Slučajno smo se našli.
• Našli smo se slučajno.
• Mi smo se slučajno našli.

All of these can work, though they may differ slightly in focus or style.

The original sentence sounds very natural and puts the idea of by chance up front.

It can mean both, depending on context.

In this sentence, the most natural English meaning is:

• by chance
• coincidentally

So:

Slučajno smo se našli.
= We met by chance.

If you translated it as We accidentally met, that is understandable, but We met by chance sounds more natural in English for this context.

Yes, absolutely.

That version is grammatically correct. Adding mi gives extra emphasis, something like:

• We happened to meet
• We were the ones who met by chance

In many neutral situations, though, Serbian simply leaves out the pronoun:

Slučajno smo se našli.

That is the more typical everyday wording.

Naći (se) is perfective.

That matters because perfective verbs present an action as completed, whole, or single. In this sentence, the meeting is understood as a completed event:

We met by chance.

The imperfective counterpart is usually nalaziti (se), but in this meaning it is much less likely in a sentence like this.

So:

• našli smo se = we met as a completed event
• perfective fits well because it refers to one finished occurrence

They are close, but not always identical in feel.

• Sresti se / sreli smo se = to meet / run into each other
• Naći se / našli smo se = to meet up / find each other / end up meeting

In many situations, both can be translated as we met by chance.

But naći se can sometimes sound a little broader or more idiomatic, while sresti se is more directly to encounter / meet.

In everyday conversation, both are common. The exact choice depends on context and personal style.

A simple approximate pronunciation for an English speaker is:

SLOO-chai-no smo se NAH-shlee

A few notes:

• č sounds like ch in chop
• j sounds like English y
• š sounds like sh
• lj is a softer sound, but in našli you just need shl there, since it is šl, not lj

So the tricky parts are mainly:

• Slučajno = SLOO-chai-no
• našli = NAH-shlee

The most natural translations are:

• We met by chance.
• We happened to meet.
• We ran into each other by chance.

Which one fits best depends on context, but all of these are good natural equivalents.