Ne možemo sve ponijeti odjednom.

Ne možemo means we cannot / we can’t.

• možemo = we can
• ne = the negation particle, so it makes the verb negative

So:

• možemo → we can
• ne možemo → we can’t

Možemo is the 1st person plural present tense of moći = to be able to / can.

In this sentence, it expresses ability or practical possibility, not permission. So the idea is: we’re not able to take everything at once.

Ponijeti means to take along / to carry off with you / to bring along, depending on context.

In this sentence, it has the sense of taking or carrying something with us.

A useful nuance:

• ponijeti is perfective
• it suggests a completed act of taking/carrying something

So sve ponijeti is closer to:

• take everything
• carry everything away
• bring everything along

as one complete action, not as an ongoing process.

That fits well with odjednom = all at once / in one go.

After modal verbs like moći (can / to be able to), Croatian normally uses an infinitive.

So the structure is:

• možemo ponijeti = we can take
• ne možemo ponijeti = we can’t take

This is very similar to English:

• we can carry
• we can’t carry

So in the full sentence:

• Ne možemo sve ponijeti odjednom.
• literally: We cannot everything take all at once.

The most natural English order is: We can’t take everything at once.

Here sve means everything.

It is functioning as the direct object of ponijeti, so it is in the accusative.

A helpful thing for learners is that sve can mean different things depending on how it is used:

• sve = everything
• sve knjige = all the books
• sve je dobro = everything is fine

In this sentence, because there is no noun after it, sve stands on its own and means everything.

Because when Croatian uses everything as a standalone pronoun, the form is sve.

This is one of those forms that English speakers often notice because sva also exists, but it is used differently.

Very roughly:

• sav = masculine singular base form
• sva = feminine singular or neuter plural in some uses
• sve = neuter singular nominative/accusative, and this is the form commonly used for everything

So in Ne možemo sve ponijeti odjednom, sve is the correct form for everything.

Here odjednom means all at once, in one go, or in one trip/load depending on context.

So the sentence means that it is not possible to take everything in a single attempt.

Important nuance: odjednom can also mean suddenly in other contexts.

For example:

• Odjednom je počelo padati. = Suddenly it started raining.

But in your sentence, because it is used with ponijeti and sve, it clearly means:

• all at once
• all in one go

not suddenly.

No, Croatian word order is fairly flexible.

Ne možemo sve ponijeti odjednom is a very natural and neutral order, but other orders are also possible, for example:

• Ne možemo odjednom sve ponijeti.
• Sve ne možemo ponijeti odjednom. (more marked, depending on emphasis)

The usual sentence you gave sounds natural because it flows like this:

• Ne možemo = we can’t
• sve = everything
• ponijeti = take/carry
• odjednom = all at once

So it puts the basic message first and the manner/time-like idea odjednom at the end.

This is a very useful aspect question.

• nositi = to carry, usually imperfective
• ponijeti = to take/carry along, perfective

So:

• nositi focuses more on the process or repeated action of carrying
• ponijeti focuses more on successfully taking/carrying something as a whole action

Compare the feel:

• Ne možemo sve nositi odjednom.
  = We can’t be carrying everything at once / We can’t carry everything all at once.
  This sounds more process-oriented.

• Ne možemo sve ponijeti odjednom.
  = We can’t take everything in one go.
  This sounds more like a completed task that is too big to do at once.

In your sentence, ponijeti is a very natural choice because the speaker is thinking about getting everything moved/taken in one attempt.

Yes, moći can sometimes refer to:

• ability
• possibility
• permission

So ne možemo could, in principle, mean:

• we can’t
• we’re not able to
• we’re not allowed to

But context usually makes the meaning clear.

In Ne možemo sve ponijeti odjednom, the natural reading is lack of practical ability/possibility:

• there is too much stuff
• it is too heavy
• one trip is not enough

So here it means we can’t manage it, not we’re not allowed to do it.

Usually it implies one go, which often means one trip, one load, or one attempt, depending on the situation.

For example:

• if you are moving boxes, it means we can’t carry all of them in one trip
• if you are packing, it means we can’t take all of it at the same time

So odjednom is broader than just a literal moment in time. It often means:

• not piece by piece
• not in several rounds
• not all together in a single attempt