Revisamos el pespunte, el remiendo y el descosido.

Because Spanish often drops subject pronouns when the verb ending already makes the subject clear.

• revisamos already tells you the subject is we
• So Nosotros revisamos... is possible, but usually unnecessary
• You would normally add nosotros only for emphasis, contrast, or clarity

For example:

• Revisamos el pespunte... = We check/review the topstitching...
• Nosotros revisamos el pespunte, no ellos = We check the topstitching, not them

Revisamos can be either:

• present indicative = we check / we review
• preterite = we checked / we reviewed

These two forms are identical for nosotros verbs ending in -ar.

So without context, the sentence is ambiguous. Only the wider context tells you which one is meant.

• In instructions, routines, or descriptions of a process, it will often be present
• In a story or report about completed actions, it can be preterite

Not usually. This is a very common learner question because the words look related.

In Spanish, revisar often means:

• to check
• to inspect
• to look over
• to review

So in this sentence, revisamos is more like we inspect/check/review, not necessarily we revise in the English sense of rewriting or altering something.

For English revise as in changing a text or improving it, Spanish might use:

• corregir
• modificar
• revisar in some contexts, but usually with the sense of looking over it first

Because in Spanish it is very natural to repeat the definite article in a list when each item is being treated as a separate, identifiable thing.

So:

• el pespunte, el remiendo y el descosido

sounds natural and clear.

Repeating the article can make the list feel more precise, especially in technical or inspection-style language.

In English, we often say the stitching, patch and undone seam, using the only once. Spanish very often prefers to repeat it more than English does.

Yes. In this sentence, all three are masculine singular nouns, which is why they all take el.

• el pespunte
• el remiendo
• el descosido

Their plural forms would be:

• los pespuntes
• los remiendos
• los descosidos

This is useful to notice because pespunte ends in -e, so its gender is not obvious just from the ending. You simply have to learn it with the article: el pespunte.

Because Spanish can turn a participle or adjective into a noun by using an article with it.

So descosido can be:

• an adjective meaning something like unstitched or come undone
• or a noun, as in el descosido, meaning the undone part, unstitching, or seam that has come apart

This is very common in Spanish.

A similar idea is:

• lo bueno = the good thing / what is good
• el herido = the injured man / the wounded person
• el descosido = the unstitched area / the undone seam

Because y normally means and, and it only changes to e before words that begin with an i sound.

So:

• padre e hijo
• España e Italia

But here the next word is descosido, which begins with a d sound, so y is correct:

• el remiendo y el descosido

Because standard Spanish normally does not use the Oxford comma.

So the usual pattern is:

• A, B y C

That is exactly what you see here:

• el pespunte, el remiendo y el descosido

A comma before y can appear in special cases, but not in a simple list like this.

Yes, it is grammatically natural, but the vocabulary is quite specialized.

This sounds like language from:

• sewing
• tailoring
• clothing repair
• textile production
• quality control

A native speaker would understand the grammar immediately, but words like pespunte and descosido are not especially common in everyday casual conversation unless the topic is clothes, sewing, or repairs.

Yes, very possibly.

Because the sentence is technical and lists physical features or defects, revisamos may sound more like:

• we inspect
• we check
• we examine

than simply we review.

So even if the meaning has already been provided to the learner, it is worth knowing that revisar often overlaps with inspect/check, especially in practical or technical contexts like this one.