On ima veliku moć.

• On = he
• ima = has
• veliku = big / great in a form that agrees with the object
• moć = power

So the structure is:

• On = subject
• ima = verb
• veliku moć = direct object

Croatian often works very similarly to English here: He has great power.

Because moć is a feminine noun, and in this sentence it is the direct object, so it is in the accusative singular.

The adjective must match the noun in:

• gender
• number
• case

So:

• nominative feminine singular: velika moć = great power / the great power as a subject
• accusative feminine singular: veliku moć = great power as a direct object

Since moć is what he has, Croatian uses the accusative, and the adjective changes to veliku.

Because some Croatian feminine nouns do not change form between nominative and accusative singular.

So:

• nominative: moć
• accusative: moć

The case is still accusative, even though the noun looks the same. You can tell from:

• its role in the sentence
• the adjective form veliku, which clearly shows accusative feminine singular

This is very common in Croatian: sometimes the adjective shows the case more clearly than the noun itself.

Yes. Very often, Croatian leaves out subject pronouns when they are already clear from the verb.

Since ima already means he/she/it has, the sentence:

Ima veliku moć.

can also mean He has great power, depending on context.

Including on usually adds:

• emphasis
• contrast
• clarity

For example:

• On ima veliku moć, a ja nemam. = He has great power, and I do not.

In most normal contexts, ima simply means has.

It is the 3rd person singular present tense of imati = to have.

Examples:

• Ja imam = I have
• Ti imaš = you have
• On/ona/ono ima = he/she/it has

Croatian does not usually make the same kind of has / is having distinction that English sometimes does.

Yes. Croatian word order is more flexible than English because case endings show grammatical roles.

The most neutral order here is:

On ima veliku moć.

But you may also see:

• Ima veliku moć.
• Veliku moć ima on.
• On veliku moć ima.

These alternatives can sound more emphatic, literary, or contrastive depending on context.

For a learner, the safest default is: subject + verb + object

So On ima veliku moć is a very good standard form.

In this sentence, veliku moć usually means great power rather than physically big power.

Croatian velik can mean:

• big
• large
• great

The exact meaning depends on context.

With abstract nouns like moć (power), English usually prefers great power. So although veliku literally connects to big/large, the natural translation is often great.

moć is pronounced approximately like moch, but with a softer final sound than English ch.

About ć:

• it is not the same as c
• it is not exactly the same as č
• it is a soft sound, roughly similar to a very soft ch

A rough learner-friendly guide:

• c ≈ ts
• č ≈ harder ch
• ć ≈ softer ch

So moć sounds roughly like moch, but softer and lighter at the end.

Because Croatian does not have articles like English a/an and the.

So moć can mean:

• power
• the power

and veliku moć can mean:

• great power
• the great power

The exact meaning depends on context.

This is normal in Croatian, so you do not need to add any separate word for a or the.

It is capitalized only because it is the first word of the sentence.

Normally, on is written with a lowercase o:

• on = he

It is not capitalized because it is special grammatically.

It can be both, but not in the same role.

In this sentence, moć is a noun meaning power.

There is also the verb moći = can / to be able to.

For example:

• On može doći. = He can come.

So learners should be careful:

• moć = power (noun)
• moći / može = can / be able to (verb)

In On ima veliku moć, it is definitely the noun power.