Revisamos el sello electrónico; añadimos la firma electrónica.

Because Spanish often drops the subject pronoun when the verb ending already shows who is doing the action.

• revisamos = we review / we reviewed
• añadimos = we add / we added

So nosotros/nosotras is understood and does not need to be stated.

You could say Nosotros revisamos... if you want emphasis or contrast, but in normal Spanish it is usually omitted.

By themselves, they can be either:

• Present: we review / we add
• Preterite (simple past): we reviewed / we added

This happens because, for many regular verbs, the nosotros form is the same in the present and the preterite.

So the sentence is ambiguous in isolation. Context tells you which meaning is intended:

• Hoy revisamos el sello electrónico... = present
• Ayer revisamos el sello electrónico... = past

They are:

• revisar → revisamos
• añadir → añadimos

So this sentence uses two regular verbs:

• revisar = to review / check
• añadir = to add

Because Spanish nouns have grammatical gender.

• sello is masculine → el sello
• firma is feminine → la firma

The article must match the noun’s gender.

Because adjectives in Spanish usually agree with the noun they describe.

• sello is masculine singular → electrónico
• firma is feminine singular → electrónica

So:

• el sello electrónico
• la firma electrónica

This is standard adjective agreement.

They are related, but they are not exactly the same thing, especially in formal or legal Spanish in Spain.

• firma electrónica usually refers to an electronic signature, often linked to a person
• sello electrónico usually refers to an electronic seal/stamp, often linked to an organization, institution, or entity

So the sentence is talking about two different digital validation tools, not just repeating the same idea with different words.

Not usually in the English edit/correct sense.

In this sentence, revisar most likely means:

• to check
• to inspect
• to review

This is a very common false-friend issue for English speakers. Spanish revisar often means check over rather than rewrite or improve.

So here revisamos el sello electrónico is more like we check/review the electronic seal, not necessarily we revise it.

The semicolon links two closely related complete clauses:

• Revisamos el sello electrónico
• añadimos la firma electrónica

It gives the sentence a slightly more formal, written, procedural feel.

You could also say:

• Revisamos el sello electrónico y añadimos la firma electrónica.

That is also correct and more neutral in everyday writing.

A comma alone would usually be less appropriate here in standard writing.

Yes, Spanish speakers would understand it, but añadir is a very natural choice here, especially in Spain and in formal/administrative language.

• añadir = standard and very natural
• agregar = also correct, but can sound less typical in Spain depending on context

So for Spain-focused Spanish, añadimos is an excellent choice.

ñ is a separate Spanish letter. It sounds roughly like the ny in canyon, but as a single sound.

So añadimos is approximately:

• a-nya-DI-mos

The stress falls on di: añaDImos

This is different from plain n, so año and ano, for example, are completely different words.

Because the stress falls on tró:

• e-lec-TRÓ-ni-co

Without the accent mark, standard stress rules would make you stress a different syllable. The written accent shows the correct pronunciation.

By contrast, añadimos has no written accent because its stress already follows the normal spelling rules:

• a-ña-DI-mos

Sometimes yes, if the context already makes it obvious.

For example:

• Revisamos el sello electrónico; añadimos la firma.

This could work if everyone already knows the signature is electronic.

But the full version:

• Revisamos el sello electrónico; añadimos la firma electrónica.

is clearer and more precise, especially in technical, legal, or administrative language. Repeating the adjective removes any doubt.