Susjeda je jučer donijela malo štene, a moja sestra je odmah uzela mače u naručje.

Je is the auxiliary verb to be used to form the Croatian perfect tense.

So:

• Susjeda je donijela = The neighbor brought / has brought
• moja sestra je uzela = my sister took / has taken

It appears twice because there are two separate clauses joined by a:

1. Susjeda je jučer donijela malo štene
2. a moja sestra je odmah uzela mače u naručje

Each clause has its own verb phrase, so each one needs its own auxiliary.

Because the subject is feminine singular in both clauses:

• susjeda = female neighbor
• sestra = sister

In Croatian, the past participle agrees with the subject in gender and number.

So you get:

• feminine singular: donijela, uzela
• masculine singular: donio, uzeo
• neuter singular: donijelo, uzelo

Yes. In standard Croatian:

• susjed = male neighbor
• susjeda = female neighbor

So the form donijela matches that feminine subject correctly.

In Croatian, many nouns for young animals are grammatically neuter.

So:

• štene = puppy
• mače = kitten

That is why the adjective is also neuter:

• malo štene = small/little puppy

This is grammatical gender, not necessarily biological sex.

Because adjectives must agree with the noun in gender, number, and case.

Since štene is:

• neuter
• singular
• here in the accusative (direct object)

the adjective must also be neuter singular:

• malo štene

So:

• mali = masculine
• mala = feminine
• malo = neuter

Because it is a neuter singular noun, and in Croatian the nominative and accusative forms of many neuter nouns are the same.

So:

• nominative: mače
• accusative: mače

The same thing happens with štene.

That is why both direct objects appear unchanged in form.

Because Croatian uses different cases after u depending on whether there is:

• movement toward/into something → accusative
• location in something → locative

Here, the sister took the kitten into her arms, so there is movement:

• u naručje = into the arms / into one’s lap

If you were describing location, you would use:

• u naručju = in the arms / in one’s lap

Compare:

• Uzela je mače u naručje. = She took the kitten into her arms.
• Mače je bilo u naručju. = The kitten was in her arms.

By default, it means her arms—the subject’s arms, in this case the sister’s.

Croatian often leaves this kind of possessive unstated when it is obvious from context.

So:

• uzela mače u naručje naturally means she took the kitten into her arms

If you wanted to make it explicit, you could say:

• u svoje naručje = into her own arms

But in normal speech that is often unnecessary.

Here a is best translated as and, but it often has a slight sense of contrast, shift of focus, or meanwhile.

It is weaker than ali (but).

So in this sentence, a connects the two events smoothly:

• The neighbor brought a small puppy, and my sister immediately took the kitten into her arms.

It sounds natural because the second clause shifts attention from the neighbor to the sister.

Croatian word order is flexible, but the auxiliary je is a clitic, and clitics usually go in the second position in the clause.

So:

• Susjeda je jučer donijela...
• Moja sestra je odmah uzela...

This is very normal Croatian word order.

The je comes after the first stressed word or phrase:

• Susjeda | je
• moja sestra | je

Yes. Croatian allows fairly flexible word order, especially with adverbs.

For example:

• Jučer je susjeda donijela malo štene.
• Moja sestra je mače odmah uzela u naručje.
• Moja sestra je odmah mače uzela u naručje.

These are possible, although some sound more neutral than others.

The original sentence sounds natural and straightforward:

• jučer sits near the first verb
• odmah sits near the second verb

Because donijeti and uzeti are perfective verbs, which present the actions as completed single events.

That fits the sentence well:

• the neighbor brought the puppy
• the sister immediately took the kitten

If you used imperfective verbs such as donositi or uzimati, the meaning would suggest repeated action, process, or ongoing action, which is not what this sentence is describing.

Because Croatian has no articles.

So there is no direct equivalent of English a/an or the.

Whether a noun means a puppy, the puppy, a kitten, or the kitten depends on context.

In this sentence:

• malo štene is naturally understood as a small puppy
• mače is naturally understood as the/a kitten, depending on the context already established

If Croatian wants to be more specific, it can use words like:

• to mače = that kitten
• ovo štene = this puppy