Poslije oluje pojavila se duga iznad starog drveta.

Oluje is in the genitive singular.

The preposition poslije (after) normally takes the genitive in Croatian, so:

• oluja = storm
• poslije oluje = after the storm

This is a very common pattern:

• poslije škole = after school
• poslije ručka = after lunch

So the learner should remember: poslije + genitive.

Yes. Nakon oluje is also correct and means the same thing here.

Both poslije and nakon can mean after and are followed by the genitive:

• poslije oluje
• nakon oluje

In everyday use, both are common. A learner will hear both.

The verb here is pojaviti se, which means to appear.

So se is not optional in this sentence. It is part of the verb expression:

• pojaviti se = to appear
• pojavila se = appeared

Without se, pojaviti usually means something more like to show, to produce, or to make something appear, depending on context.

So in this sentence:

• pojavila se duga = a rainbow appeared

This is about Croatian clitic placement. The word se is a clitic, and clitics usually come in the second position of a clause.

In this sentence, the first chunk is:

• Poslije oluje

Then the predicate begins, and se is placed early in the clause:

• Poslije oluje pojavila se duga.

You may also hear different word orders in Croatian, but se still tends to stay in its clitic position. Croatian word order is more flexible than English, but clitic placement has its own rules.

Because duga is the subject of the sentence, so it is in the nominative singular.

• duga = rainbow

If it were a direct object, you might see another form, such as dugu in the accusative. But here the rainbow is the thing that appeared, so it is the subject:

• pojavila se duga = the rainbow appeared

Yes. Duga is a feminine noun.

You can see that in the past tense verb form:

• pojavio se = masculine subject
• pojavila se = feminine subject
• pojavilo se = neuter subject

Since duga is feminine, the verb agrees with it:

• pojavila se duga

That agreement is very important in Croatian.

Drveta is in the genitive singular.

The preposition iznad (above) takes the genitive, so:

• drvo = tree
• iznad drveta = above the tree

Because the noun is in the genitive, the adjective must match it:

• staro drvo = the old tree
• iznad starog drveta = above the old tree

So the whole phrase is:

• iznad
  • genitive
• iznad starog drveta

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

Here the noun is:

• drvo = neuter singular
• in this sentence: drveta = genitive singular

So the adjective star must also be genitive singular neuter:

• staro drvo = nominative singular
• starog drveta = genitive singular

For many adjectives, the genitive singular masculine and neuter ending is -og.

Because drvo has more than one genitive form in usage, and drveta is a normal, standard form for tree in this kind of sentence.

• drvo = tree
• drveta = of the tree

Learners should be aware that drvo / drva can also relate to wood as a material or to plural-related patterns, so forms around this noun can feel tricky at first. In this sentence, iznad starog drveta is a natural and standard way to say above the old tree.

In form, oluje can be ambiguous in Croatian:

• it can be genitive singular
• or nominative plural

But in this sentence, because poslije requires the genitive, it must be genitive singular:

• poslije oluje = after the storm

So context and grammar tell you which meaning is correct.

Yes, Croatian word order is more flexible than English.

The basic sentence is:

• Poslije oluje pojavila se duga iznad starog drveta.

But other orders may also be possible, depending on emphasis, for example:

• Duga se pojavila poslije oluje iznad starog drveta.
• Iznad starog drveta pojavila se duga poslije oluje.

These versions can sound more marked or emphasize different parts of the sentence. The original sentence is natural and neutral.

Because Croatian has no articles like English a or the.

So:

• duga can mean a rainbow or the rainbow
• staro drvo / starog drveta can mean an old tree / the old tree

Context tells you whether the meaning is definite or indefinite.

This is a major difference from English, and it often feels strange at first for English-speaking learners.

It is the past tense.

Croatian past tense is usually made with:

1. the l-participle of the verb
2. a form of biti (to be), although in some sentence types the auxiliary may not appear in the way beginners expect, especially in short or stylistically simple examples

For this learner sentence, the important thing is to recognize:

• pojavila se = appeared

Also note the feminine ending -la, which agrees with duga.

Yes, it is natural and correct.

It has several very typical Croatian features:

• poslije + genitive
• pojaviti se for appear
• agreement between subject and past-tense verb
• iznad + genitive
• adjective-noun agreement in case, gender, and number

So it is a good example sentence for practicing real Croatian grammar.