Možete li mi je sutra donijeti, tu malu torbu, ili ćete je ostaviti kod susjede?

They are 2nd person plural forms, but in Croatian that can mean either:

• you all / you plural, or
• you singular, politely/formally

So without more context, the sentence could be addressed to one person politely or to several people.

If you wanted informal singular, you would say:

• Možeš li mi je sutra donijeti ... ili ćeš je ostaviti ... ?

Li is a question particle used to form a yes/no question.

So:

• Možete = you can / you are able
• Možete li ... ? = Can you ... ?

In standard Croatian, li usually comes right after the finite verb:

• Možete li ... ?
• Znate li ... ?
• Želite li ... ?

No. Here je is not the verb is.

In this sentence, je is the short unstressed pronoun meaning it or her. It refers to torba, and since torba is feminine, the pronoun is feminine too.

So here:

• mi = to me
• je = it (the bag)

Croatian je can also mean is, but not in this sentence.

Because the sentence has both an indirect object and a direct object:

• mi = to me
• je = it

So donijeti mi je means bring it to me.

The order is not random. These short pronouns are clitics, and clitics in Croatian tend to follow a fixed order. Here the dative pronoun mi comes before the accusative pronoun je:

• mi je

That is why you get:

• Možete li mi je sutra donijeti ... ?

Because it is the direct object, so it is in the accusative case.

The base forms are:

• ta torba = that bag
• mala torba = small bag

In the accusative singular feminine, they become:

• ta → tu
• mala → malu
• torba → torbu

So:

• tu malu torbu = accusative singular feminine

All three words agree with each other.

Yes, it is a kind of repetition, but it is very natural in Croatian, especially in speech.

The pronoun je already tells us it, and then tu malu torbu is added to clarify exactly what it means:

• Možete li mi je sutra donijeti, tu malu torbu ...

This works like an extra clarification, almost like:

• Can you bring it to me tomorrow — that small bag — or ...

If the context is already clear, the speaker could leave out the noun phrase and just say:

• Možete li mi je sutra donijeti?

Because tu malu torbu is inserted as a clarifying extra phrase rather than being placed in the most neutral position in the sentence.

The commas show a pause, like an afterthought or explanation:

• Možete li mi je sutra donijeti, tu malu torbu, ili ćete ...

Without that inserted clarification, the sentence would be more straightforward:

• Možete li mi je sutra donijeti ili ćete je ostaviti kod susjede?

Because mi and je are short unstressed clitics, and Croatian strongly prefers to keep such clitics together near the beginning of the clause.

So this sounds natural:

• Možete li mi je sutra donijeti

Croatian word order is flexible, but clitics are much less flexible than full words. That is why sutra comes after the pronouns here.

Because the whole sentence is one alternative question:

• Can you bring it tomorrow, or will you leave it at the neighbor's?

Croatian usually marks the question at the start, and then the second clause is simply the alternative introduced by ili (or).

So:

• Možete li ... ili ćete ... ?

is completely normal.

This is the future tense.

Croatian commonly forms the future with:

• ću, ćeš, će, ćemo, ćete, će
  • infinitive

So:

• ćete ostaviti = you will leave

Here:

• ćete = you will
• ostaviti = leave

That is different from možete donijeti, where možete is present tense of moći (can, be able to) plus an infinitive.

Kod usually means something like:

• at
• by
• to the place of
• with, in the sense of being at someone's place

It takes the genitive case.

So:

• susjeda = female neighbor
• kod susjede = at the female neighbor's place / with the female neighbor

That is why the form is susjede, not susjeda.

Yes. In this sentence, susjede is the genitive singular of susjeda, which means female neighbor.

If it were a male neighbor, you would have:

• susjed = male neighbor
• kod susjeda = at the male neighbor's place

So the form here specifically points to a female neighbor.

Because donijeti and ostaviti are being used as completed, one-time actions.

This is a question about a specific result:

• Will you bring it tomorrow?
• Or will you leave it at the neighbor's?

That is why the perfective verbs fit well:

• donijeti = bring, as a completed act
• ostaviti = leave, as a completed act

If you used imperfective verbs such as donositi or ostavljati, the meaning would sound more ongoing, repeated, or less focused on one completed action.