Devo compilare il documento correttamente.

Devo is the first-person singular present tense of dovere, which means to have to / must.

So:

• devo = I must / I have to

In this sentence, the speaker is saying that they are obliged or required to do something.

Because after the modal verb dovere, Italian normally uses an infinitive.

So the pattern is:

• dovere + infinitive
• devo compilare = I must fill out

This is similar to English:

• I must fill out
• not I must fill outs

Other common Italian modal verbs work the same way:

• posso parlare = I can speak
• voglio mangiare = I want to eat
• devo studiare = I have to study

Not usually in the English sense of compile.

In Italian, compilare often means:

• to fill out
• to complete
• especially for forms, documents, applications, questionnaires, and similar paperwork

So in this sentence, compilare il documento usually means fill out the document or complete the document, not compile the document.

This is a useful false-friend warning for English speakers.

Italian uses the definite article much more often than English.

So il documento literally means the document, but in English we may simply say the document even when it sounds obvious from context. Italian strongly prefers the article here.

That means:

• compilare il documento = to fill out the document

Leaving out il would usually sound incomplete or unnatural in a normal sentence like this.

Correttamente is an adverb meaning:

• correctly
• properly

It comes from the adjective corretto (correct / proper).

So:

• corretto = adjective
• correttamente = adverb

In this sentence, it tells us how the document must be filled out:

• Devo compilare il documento correttamente.
• I have to fill out the document correctly.

That is a very natural position for an adverb in Italian, especially when it modifies the action as a whole.

So:

• Devo compilare il documento correttamente.

sounds normal and neutral.

Italian adverb placement is somewhat flexible, but the end position is very common. It keeps the sentence clear and natural.

Yes, you can.

Both of these are possible:

• Devo compilare il documento correttamente.
• Devo compilare correttamente il documento.

The first one is very neutral and common.
The second can put slightly more focus on correctly before you reach the document.

You may also hear other word orders in specific contexts, but the original sentence is a very standard choice.

Because dovere is followed directly by the infinitive.

So you say:

• devo compilare
• devi studiare
• dobbiamo partire

Not:

• devo a compilare

This is different from some English patterns and also from some other Italian structures that do require a preposition.

Yes. In many everyday contexts, devo can be translated as either:

• I must
• I have to

The exact English choice depends on tone and context.

For example:

• Devo compilare il documento correttamente. could be
• I must fill out the document correctly.
• I have to fill out the document correctly.

In normal speech, have to is often the most natural English translation, while must can sound stronger or more formal.

It depends on what kind of paper you mean.

• documento = document
• modulo = form

If the speaker is talking about a form with blanks to complete, modulo might be more precise:

• Devo compilare il modulo correttamente.

If it is a general document, then documento is fine.

So compilare works well with both, but the noun changes depending on the situation.

A simple pronunciation guide is:

DEH-vo com-pee-LAH-reel doh-koo-MEN-to kor-ret-ta-MEN-te

A few helpful notes:

• devo = DEH-vo
• compilare = com-pee-LAH-re
• il documento often flows together in speech: ildocumento
• correttamente has stress on men: kor-ret-ta-MEN-te

Also remember:

• Italian r is usually trilled or tapped
• double consonants matter, so in correttamente, the tt should be held a little longer than a single t

Usually, devo is stronger than I should.

Its main meaning is:

• I must
• I have to

In some contexts, English may soften it depending on tone, but grammatically devo expresses obligation more than advice.

If you specifically wanted I should, Italian would often use:

• dovrei compilare il documento correttamente

Here:

• devo = I must / have to
• dovrei = I should / I ought to