Remendamos la rozadura y quitamos las bolitas.

Because both verbs are -ar verbs, and -amos is the nosotros/nosotras form in the present indicative.

• remendar → remendamos
• quitar → quitamos

So the sentence has an implied we: we mend/repair and we remove.

Yes. This is a very common point of confusion.

For regular -ar verbs, the nosotros form is the same in:

• the present: we mend / we remove
• the preterite: we mended / we removed

So:

• remendamos can mean either we mend or we mended
• quitamos can mean either we remove or we removed

Normally, context tells you which one is meant.

Spanish often leaves out subject pronouns because the verb ending already tells you who is doing the action.

Here, -amos already shows we, so nosotros is not necessary.

You could say Nosotros remendamos la rozadura y quitamos las bolitas, but it would usually sound more emphatic than needed.

Arreglar is a general word meaning to fix or to repair.

Remendar is more specific. It is often used for:

• mending clothes
• patching fabric
• repairing worn or damaged textile areas

So in a clothing or fabric context, remendar is a more precise choice than arreglar.

Rozadura is a feminine noun, which is why it takes la.

In this kind of context, it usually refers to a rubbed, worn, or damaged area caused by friction. The exact English word can vary depending on the situation, but grammatically the important thing is:

• singular: la rozadura
• feminine
• direct object of remendamos

Spanish uses articles more often than English does.

Here, la shows that the speaker is talking about a specific worn/damaged area, not just the general idea of wear.

So la rozadura sounds natural because it means the particular rubbed area that is being repaired.

Bolitas comes from bola, meaning ball, with the diminutive ending -ita, so literally it means little balls.

In fabric/clothing context, bolitas usually refers to the small balls of fluff or pilling that appear on material.

The ending -ita often suggests:

• small size
• sometimes a more natural or everyday way of referring to something

And las is plural because there is more than one.

Because bolita is feminine.

It comes from bola, which is feminine, so the diminutive keeps the same gender:

• la bola
• la bolita
• las bolitas

So the article must agree with the noun: las bolitas.

Because quitar normally takes a direct object: you remove something.

Here, the thing being removed is las bolitas, so no preposition is needed:

• quitamos las bolitas

If you want to say where they are removed from, then you add a phrase with de:

• quitamos las bolitas del jersey

So las bolitas is the direct object, and any source or location can be added separately.

In most of Spain, the z is pronounced like the th in think.

So rozadura is approximately:

• ro-tha-DU-ra

In much of Latin America, and in some parts of Spain, it would sound more like:

• ro-sa-DU-ra

Since you asked about Spanish from Spain, the th pronunciation is the one most learners expect.