Escribo el código postal antes de sellar el paquete.

Spanish often leaves out subject pronouns when the verb already makes the subject clear. Escribo means I write or I am writing, so yo is not necessary.

You could say Yo escribo el código postal..., but that usually adds emphasis, contrast, or clarity, such as:

• Yo escribo el código postal, pero tú pegas la etiqueta.
• Yo escribo el código postal antes de sellar el paquete.

In a normal sentence, dropping yo sounds more natural.

The simple present escribo is very common in Spanish and can cover several ideas that English separates:

• I write
• I am writing
• I do write

In a sentence like this, escribo can describe:

• a routine or habit
• a step in a process
• something happening now, depending on context

Estoy escribiendo would put more emphasis on the action being in progress right now. But for a general statement like this, escribo is completely natural.

It could mean either, depending on context.

Spanish present tense is flexible. So this sentence might mean:

• a regular habit: I write the ZIP/postal code before sealing the package
• a current action in a narrative or explanation: I write the postal code before sealing the package

Without more context, both are possible.

After antes, Spanish normally uses de before an infinitive.

So the pattern is:

• antes de + infinitive

Examples:

• antes de comer
• antes de salir
• antes de sellar

So antes de sellar el paquete means before sealing the package or before I seal the package.

Because after antes de, Spanish uses the infinitive when the action is general and not tied to a separately stated subject.

So:

• antes de sellar el paquete = before sealing the package / before I seal the package

If Spanish wanted to use a full conjugated verb instead, the structure would be different, for example with antes de que:

• antes de que selle el paquete

That version is more explicitly clause-based and is usually used when the subject needs to be expressed or when the structure calls for it.

Here, sellar means to seal the package, in the sense of closing it securely.

For a package, that usually means taping it shut or otherwise closing it.

Be careful: sello can also mean stamp, and sellar can sometimes mean to stamp in other contexts. But in sellar el paquete, the natural meaning is to seal the package.

Spanish uses definite articles more often than English does.

In this sentence:

• el código postal
• el paquete

The article helps mark these as specific things involved in the situation. English often drops the in places where Spanish keeps it, or uses it differently.

So even if English might say something like I write the postal code before sealing the package, Spanish naturally keeps el with both nouns.

Yes. Escribir is a normal verb for to write, including writing down information like:

• a name
• an address
• a number
• a postal code

Depending on context, Spanish speakers might also use verbs like:

• anotar = to write down / note down
• poner = to put / write

But escribo el código postal is perfectly natural.

In Spanish, descriptive adjectives usually come after the noun.

So:

• código postal = postal code

Here, postal describes the type of código. This noun + adjective order is very common in Spanish.

Compare:

• correo electrónico
• número telefónico
• servicio público

The written accents in Spanish show which syllable is stressed.

So código is stressed on the first syllable:

• CÓ-di-go

Without the accents, the word would not follow normal stress rules and could be mispronounced.

Accent marks in Spanish are important because they can:

• show pronunciation
• distinguish between words
• help with correct spelling

No. If you use antes de que, the verb after it must be conjugated in the subjunctive, not the indicative.

So you would say:

• antes de que selle el paquete

Not:

• antes de que sello el paquete

However, in your original sentence, antes de sellar el paquete is simpler and very natural.

Yes, código postal is the standard and widely understood term across Latin America.

In conversation, people may sometimes mention local systems or country-specific terms, but código postal is the general expression learners should know and use.

For English speakers, it corresponds to postal code, and in some contexts to ZIP code, although ZIP code is specifically a U.S. term.

Yes, Spanish allows some flexibility in word order, though the original sentence is very natural.

For example, you could say:

• Antes de sellar el paquete, escribo el código postal.

This version puts the time relationship first. The meaning stays the same.

The original version:

• Escribo el código postal antes de sellar el paquete.

is also completely natural and probably the most straightforward.