Povuci crtu ispod naslova, molim te.

Povući is the infinitive form: to pull / to draw.

Povuci is the imperative form used when telling one person to do something:

• povući = to draw / to pull
• povuci = draw! / pull!

In this sentence, Croatian is giving a command, so the imperative is needed.

Also, povući is a perfective verb, which fits well here because the action is seen as one complete action: draw one line.

Croatian often does not state the subject pronoun when it is already clear from the verb form.

Here, povuci already means you (singular) draw/pull!, so adding ti would usually be unnecessary.

That is very normal in Croatian:

• Dođi. = Come.
• Sjedni. = Sit down.
• Povuci crtu. = Draw a line.

Because crtu is the accusative singular form of crta.

• crta = the basic dictionary form, nominative singular
• crtu = accusative singular

In this sentence, crtu is the direct object of the verb povuci: it is the thing being drawn.

This is a very common pattern with feminine nouns ending in -a:

• knjiga → knjigu
• olovka → olovku
• crta → crtu

Here, crta means line.

Depending on context, crta can also mean things like:

• a line
• a stroke
• a dash
• a stripe

In this sentence, it specifically means a written/drawn line under something.

Because the preposition ispod requires the genitive case.

The noun naslov changes like this:

• naslov = nominative singular
• naslova = genitive singular

So:

• ispod
  • genitive
• ispod naslova = under/below the title

This is something learners need to memorize with prepositions: many Croatian prepositions regularly require a specific case.

Usually, ispod naslova is the better choice here.

Why:

• ispod means below / underneath
• pod often refers more directly to being under something in space

So ispod naslova sounds natural for below the title on a page.

Also, in instructions like this, Croatians would very often use a different verb altogether:

• Podvuci naslov. = Underline the title.

That is often more natural than literally saying draw a line under the title.

Molim te is a polite way to say please when speaking to one person informally.

Literally, it comes from moliti = to ask / to beg, but in everyday Croatian it often functions just like please.

• molim te = informal singular
• molim vas = formal singular or plural

So if you were speaking to a teacher, stranger, or more than one person, you would normally say:

• Povucite crtu ispod naslova, molim vas.

Yes. It is informal because of:

• povuci = imperative for one person
• te in molim te = you singular informal

You would say this to:

• a friend
• a child
• a classmate
• someone you address with ti

For formal or plural you, Croatian would use:

• Povucite crtu ispod naslova, molim vas.

No, Croatian word order is fairly flexible.

The sentence as given is completely natural:

• Povuci crtu ispod naslova, molim te.

But you could also hear:

• Molim te, povuci crtu ispod naslova.
• Povuci, molim te, crtu ispod naslova.

The most common difference is usually about emphasis or style, not basic meaning.

Yes. A very natural alternative is:

• Podvuci naslov, molim te.

This means Underline the title, please.

Why it sounds natural: Instead of saying draw a line under the title, Croatian often uses the verb podvući = to underline.

So both are understandable, but Podvuci naslov may sound more direct and idiomatic in many situations.

Yes, crtu can be tricky for English speakers because of the consonant cluster crt.

A rough pronunciation guide:

• c in Croatian = ts
• r is tapped/trilled
• u = oo

So crtu sounds roughly like TSR-too, with a very short r sound.

The whole sentence can be approximated like this:

• POH-voo-tsee TSR-too EES-pod NAHS-loh-va MOH-leem teh

That is only an approximation, but it can help at first.