Si vols, després podem tornar a la botiga i canviar les botes per unes sabatilles més còmodes.

Si vols literally means if you want, and in this kind of sentence it often sounds like if you’d like or if you want to.

Vols is the you form of voler (to want), so Catalan does not need the subject pronoun tu. The verb ending already tells you who the subject is.

• si vols = if you want
• si tu vols = also possible, but more emphatic

Because si without an accent means if.

• si = if
• sí = yes

So Si vols means If you want, not Yes, you want.

Here si vols works like a short parenthetical expression, similar to if you want or if you like in English. The comma marks that little pause:

• Si vols, després podem...

It makes the sentence sound natural and conversational.

Yes, podríem would be possible, but podem is very natural here.

Catalan often uses the present tense podem (we can) to make a suggestion that English might express as we can or we could, depending on context.

• podem = straightforward, natural suggestion
• podríem = a bit more tentative or softer

So this sentence sounds like a normal practical suggestion: we can go back later...

Here tornar means to return / to go back, and a la botiga means to the shop. The a is the preposition to.

So:

• tornar a la botiga = to go back to the shop

This is different from the pattern tornar a + infinitive, which means to do something again:

• tornar a provar = to try again

In your sentence, a la botiga is a place, not an infinitive, so the meaning is clearly return to the shop.

Also, it is a la botiga because botiga is feminine. Catalan contracts a + el to al, but a + la stays a la.

Because both infinitives depend on the same verb podem:

• podem tornar a la botiga
• (podem) canviar les botes...

Catalan, like English, often avoids repeating the same auxiliary or modal when it applies to both verbs.

So:

• podem tornar a la botiga i canviar...

means

• we can go back to the shop and exchange...

In this structure, canviar X per Y means to exchange X for Y.

So:

• canviar les botes per unes sabatilles = exchange the boots for some trainers/sneakers

Here per introduces the new thing you get in exchange.

This is a very useful pattern to remember:

• canviar una camisa per una altra
• canviar el producte per un de millor

Because the sentence is talking about:

• les botes = a specific pair of boots already known in the conversation
• unes sabatilles = some replacement shoes, not yet specifically identified

So the article choice matches the meaning:

• les = the, something definite/already known
• unes = some / a pair of, something indefinite or not yet specified

Because footwear is normally expressed in the plural, just as in English with words like boots or trainers.

So:

• les botes usually means the pair of boots
• unes sabatilles usually means a pair of trainers/sneakers

If you want to be extra explicit, you can say:

• un parell de sabatilles = a pair of trainers/sneakers

But the plain plural is completely normal.

It depends a bit on region and context, but in this sentence it most likely means trainers / sneakers or another kind of casual, comfortable shoe.

In some contexts, sabatilles can also mean slippers, so context matters. Since the sentence is about changing boots for something more comfortable, the most natural reading here is sneakers/trainers or similarly comfortable shoes.

Més còmodes means more comfortable.

It is plural because it describes sabatilles, which is plural. The adjective has to agree with the noun.

• sabatilla còmoda = comfortable shoe (singular)
• sabatilles còmodes = comfortable shoes (plural)
• més còmodes = more comfortable

The adjective comes after the noun because that is the normal position in Catalan for this kind of descriptive adjective:

• unes sabatilles més còmodes

Després means later / afterwards.

It tells you when the action can happen:

• Si vols, després podem... = If you want, we can... later

Its position is fairly flexible, but the placement here is very natural and conversational. It comes early because it frames the whole suggestion.

It can definitely be softer. In real speech, si vols often works like:

• if you want
• if you’d like
• if you feel like it

So it is often less about strong desire and more about giving the other person the choice in a polite, easygoing way.