Per rebre el paquet aviat, has d'escriure bé l'adreça.

Per + infinitive often expresses purpose in Catalan.

So Per rebre el paquet aviat means:

• to receive the package soon
• or more explicitly, in order to receive the package soon

This is a very common pattern:

• Per aprendre català, has de practicar. = To learn Catalan, you have to practice.
• Per entrar, necessites una clau. = To get in, you need a key.

This is the Catalan structure haver de + infinitive, which means to have to + verb.

So:

• has = you have
• d'escriure = part of haver de escriure = to write

Together:

• has d'escriure = you have to write

This expresses obligation or necessity.

A few forms of haver de in the present:

• he d'escriure = I have to write
• has d'escriure = you have to write
• ha d'escriure = he/she has to write
• hem d'escriure = we have to write
• heu d'escriure = you all have to write
• han d'escriure = they have to write

Because the preposition de is shortened before a word beginning with a vowel.

So:

• de + escriure becomes d'escriure

This is very common in Catalan:

• d'anar
• d'estudiar
• d'obrir

It works much like other contractions you see in Catalan writing.

Catalan often omits subject pronouns when the verb already makes the subject clear.

Here, has is the second person singular form, so it already tells you the subject is tu.

So:

• has d'escriure = you have to write

Catalan usually prefers:

• Has d'escriure bé l'adreça.

rather than:

• Tu has d'escriure bé l'adreça.

The pronoun tu can be added for emphasis, contrast, or clarity:

• Tu has d'escriure bé l'adreça, no ell.

Here bé means well or correctly.

So:

• escriure bé l'adreça = to write the address correctly

It is an adverb, modifying the verb escriure.

Compare:

• parlar bé = to speak well
• fer-ho bé = to do it well
• escriure bé = to write correctly / well

In this sentence, bé suggests accuracy: the address needs to be written properly so the package arrives.

Because the feminine singular article la contracts before a vowel.

So:

• la + adreça becomes l'adreça

This is the normal rule in Catalan:

• l'escola
• l'amiga
• l'entrada
• l'adreça

So adreça is a feminine noun, and its full article is la, but before the vowel a-, it becomes l'.

Aviat means soon, and here it modifies rebre: to receive soon.

So:

• Per rebre el paquet aviat = To receive the package soon

Catalan word order with adverbs is fairly flexible, but this version is natural. You could also hear:

• Per rebre aviat el paquet

Both are understandable, but the original sentence is perfectly normal.

The key point is that aviat does not describe paquet. It describes the action of receiving.

In standard Catalan, per + infinitive is the usual and safest way to express purpose.

So:

• Per rebre el paquet aviat... is the normal choice.

You may sometimes encounter per a + infinitive in some varieties or styles, but for a learner, per + infinitive is the best pattern to use in sentences like this.

So if you want to say in order to receive, use:

• per rebre

The part Per rebre el paquet aviat is an introductory purpose phrase.

The comma helps separate that introductory element from the main clause:

• Per rebre el paquet aviat, has d'escriure bé l'adreça.

This is very natural in writing, especially when the introductory phrase is a bit longer.

Without the comma, the sentence would still be understandable, but the comma makes the structure clearer.

The ç is used to keep the s sound before a, o, or u.

In Catalan:

• c before e or i usually sounds like s
• c before a, o, or u usually sounds like k

So if Catalan wrote adreca, the c would sound hard, not like the correct s sound. To keep the soft sound, it writes:

• adreça

You can see the spelling change in related forms:

• adreça
• adreces

Before e, plain c is enough, so the ç disappears.

The sentence has two main parts:

1. Per rebre el paquet aviat
   = a purpose clause
   = To receive the package soon

2. has d'escriure bé l'adreça
   = the main clause
   = you have to write the address correctly

So the overall pattern is:

purpose + obligation

You can reuse this structure easily:

• Per arribar d'hora, has de sortir ara. = To arrive on time, you have to leave now.
• Per aprovar l'examen, has d'estudiar més. = To pass the exam, you have to study more.

It changes according to the form of haver.

Here are the present-tense forms of haver de + escriure:

• he d'escriure = I have to write
• has d'escriure = you have to write
• ha d'escriure = he/she/it has to write
• hem d'escriure = we have to write
• heu d'escriure = you all have to write
• han d'escriure = they have to write

So you could say:

• Per rebre el paquet aviat, he d'escriure bé l'adreça.
• Per rebre el paquet aviat, hem d'escriure bé l'adreça.

The infinitive escriure stays the same; the form of haver changes.