Komunikacijske vještine pomažu nam pobijediti.

Because komunikacijske has to agree with vještine.

• vještina = skill
• vještine = skills

The noun vještine is feminine plural, so the adjective must also be feminine plural:

• komunikacijska vještina = communication skill
• komunikacijske vještine = communication skills

This kind of adjective-noun agreement is very important in Croatian.

Here, vještine is nominative plural because it is the subject of the sentence.

You can tell it is the subject because the verb pomažu is plural, and komunikacijske vještine are the thing doing the helping.

A useful thing to know: vještine can also look like accusative plural, so the form alone does not always tell you everything. In this sentence, the job it does in the sentence tells you it is nominative.

Pomažu is the 3rd person plural present tense of pomagati, meaning to help.

So:

• pomažem = I help
• pomažeš = you help
• pomaže = he/she/it helps
• pomažemo = we help
• pomažete = you (plural/formal) help
• pomažu = they help

Because komunikacijske vještine is plural, the verb must also be plural: pomažu.

Because the verb pomagati takes the person being helped in the dative case, not the accusative.

• nam = to us / us in the dative
• nas = us in the accusative or genitive

So Croatian structures this more like:

• Komunikacijske vještine pomažu nam pobijediti.
• Literally: Communication skills help to us win.

Even though English says help us win, Croatian uses nam.

This is about aspect, which is very important in Croatian.

• pomagati = imperfective = helping in a general, repeated, or ongoing way
• pomoći = perfective = to help as a completed act

This sentence states a general truth: communication skills help us win. For that, Croatian normally uses the imperfective verb, so pomažu is the natural choice.

Using pomognu would suggest a more specific, completed helping event, not a general statement.

In Croatian, the infinitive usually ends in -ti or -ći, and there is no separate word like English to before it.

So:

• pobijediti = to win

The ending already tells you it is an infinitive.

After pomagati, Croatian commonly uses this pattern:

• pomagati + dative + infinitive

So:

• pomažu nam pobijediti
• literally: help to-us to-win
• natural English: help us win

This is another aspect difference.

• pobijediti = perfective = to win, to achieve victory once
• pobjeđivati = imperfective = to be winning or to win repeatedly/habitually

In this sentence, the meaning is about reaching the result win, so pobijediti is the better choice.

If you used pobjeđivati, it would sound more like winning repeatedly or in general over time, which is not the main idea here.

Croatian word order is fairly flexible, so yes, nam can often move.

For example, you may also hear:

• Komunikacijske vještine nam pomažu pobijediti.

This means the same thing.

Clitic pronouns like nam often appear near the beginning of the clause, but actual placement can vary depending on style, rhythm, and emphasis. So the given sentence is understandable, and a slightly different order can also be natural.

The singular is:

• komunikacijska vještina = communication skill

So the pattern is:

• komunikacijska vještina = singular
• komunikacijske vještine = plural

This is useful because Croatian learners often want to know the dictionary form of a noun, and for vještine, that dictionary form is vještina.