Prepara la maleta avui a la nit i mira si el vol surt aviat demà al matí.

They are imperative forms, used to give instructions or commands.

• prepara = prepare!
• mira = check / look!

In this sentence, the speaker is addressing one person informally (tu), so the imperative forms are:

• (tu) prepara
• (tu) mira

Catalan often leaves out the subject pronoun, so tu is understood rather than stated.

The verb forms tell you.

• prepara, mira = informal singular (tu)
• formal singular (vostè) would be:
  • prepari
  • miri
• informal plural (vosaltres) would be:
  • prepareu
  • mireu

So this sentence is clearly giving instructions to one person in an informal way.

Catalan often uses the definite article where English uses a possessive.

So prepara la maleta naturally means pack your suitcase in context, even though it literally looks like prepare the suitcase.

This is very common, especially when the owner is obvious from the situation.

For example:

• Renta’t les mans = Wash your hands
• Obre la boca = Open your mouth

Using la teva maleta is possible, but it is usually more emphatic or contrastive, not the most neutral choice here.

Catalan usually uses the definite article more often than English does.

So:

• el vol = the flight

Even if English might sometimes say check whether your flight leaves early, Catalan naturally says mira si el vol surt...

This does not necessarily mean a specific flight has to be newly introduced in the conversation; the article is simply normal here.

Here si means whether.

In mira si el vol surt aviat, the idea is:

• check whether the flight leaves early

This is an indirect yes/no question.

Catalan uses si both for:

• if
• whether

So the exact English translation depends on context.

Examples:

• Si plou, no sortirem. = If it rains, we won’t go out.
• No sé si vindrà. = I don’t know whether he’ll come.

In your sentence, the second meaning is the right one.

Catalan, like English, often uses the present tense for scheduled future events.

So:

• el vol surt demà al matí literally looks like the flight leaves tomorrow morning
• but it refers to a future event because the time phrase makes that clear

This is very natural with timetables, transport, calendars, and plans.

Compare English:

• My train leaves at 7 tomorrow.
• The flight lands at noon.

Catalan works the same way here.

avui a la nit means tonight.

Literally it is something like:

• today at night

But in natural English, you usually translate it as tonight.

A very common alternative in Catalan is:

• aquesta nit = tonight

So these are both natural:

• Prepara la maleta avui a la nit
• Prepara la maleta aquesta nit

They are very close in meaning.

demà al matí means tomorrow morning.

It is built from:

• demà = tomorrow
• al matí = in the morning

The al is a contraction of:

• a + el = al

So:

• al matí literally = at/in the morning

Similar expressions:

• al matí = in the morning
• a la tarda = in the afternoon
• al vespre = in the evening
• a la nit = at night / tonight, depending on context

aviat is an adverb meaning early / soon, and in this sentence it modifies the verb surt.

So:

• el vol surt aviat = the flight leaves early

Putting the adverb after the verb is very normal in Catalan.

You will often see this pattern:

• arriba tard = arrives late
• marxa aviat = leaves early
• parla bé = speaks well

The word order here is completely natural.

It can mean either, depending on context.

In this sentence, with a flight and a time reference, aviat is best understood as early:

• see whether the flight leaves early tomorrow morning

But in other contexts it can mean soon:

• Tornarè aviat = I’ll come back soon

So aviat is a flexible word, and context tells you which English word fits best.

Catalan often drops subject pronouns because the verb ending usually shows who the subject is.

In your sentence:

• prepara already tells us the command is to tu
• mira also tells us the same
• surt tells us the subject is he/she/it or a singular noun, and here that noun is el vol

So Catalan does not need to say:

• Tu prepara...
• Tu mira...

Those would only be used for emphasis, contrast, or special tone.

Yes, and many learners notice this.

• preparar la maleta = prepare/pack the suitcase
• fer la maleta = literally make the suitcase, but idiomatically pack the suitcase

In everyday Catalan, fer la maleta is often very common when you mean pack your suitcase.

So these are both possible:

• Prepara la maleta...
• Fes la maleta...

The original sentence is still correct and natural; fer la maleta is just another common way to express the same idea.

Here are the main versions:

Informal singular (tu)

• Prepara la maleta avui a la nit i mira si el vol surt aviat demà al matí.

Formal singular (vostè)

• Prepari la maleta avui a la nit i miri si el vol surt aviat demà al matí.

Informal plural (vosaltres)

• Prepareu la maleta avui a la nit i mireu si el vol surt aviat demà al matí.

Formal plural (vostès)

• Preparin la maleta avui a la nit i mirin si el vol surt aviat demà al matí.

So the main changes are in the imperative verb forms.