Vull tornar aquesta camisa perquè la talla és massa gran.

Vull is the 1st person singular form of the verb voler, which means to want.

So:

• jo vull = I want
• tu vols = you want
• ell/ella vol = he/she wants

In Catalan, the subject pronoun jo is often omitted because the verb ending already shows who the subject is. So Vull by itself already means I want.

Catalan often drops subject pronouns when they are not needed for clarity. Since vull clearly means I want, adding jo is usually unnecessary.

So both are possible:

• Vull tornar aquesta camisa...
• Jo vull tornar aquesta camisa...

The version without jo sounds more natural in many everyday contexts.

Good question. Tornar can mean different things depending on context:

• to return / go back / come back
• to give back / return an item

Here, in Vull tornar aquesta camisa, it means to return this shirt to the shop.

So Catalan uses the same verb in contexts where English might distinguish between:

• I want to come back
• I want to return this shirt

Context tells you which meaning is intended.

Because camisa is a feminine singular noun, and the demonstrative must agree with it.

Catalan demonstratives agree in gender and number:

• aquest = this, masculine singular
• aquesta = this, feminine singular
• aquests = these, masculine plural
• aquestes = these, feminine plural

So:

• aquest llibre = this book
• aquesta camisa = this shirt

Because grammatical gender in Catalan is a property of the noun itself. Camisa is simply a feminine noun, so it takes feminine articles and demonstratives:

• la camisa
• aquesta camisa

As in many Romance languages, grammatical gender does not always match any logical or real-world gender. It is just part of the word you learn with the noun.

In clothing contexts, talla usually means size as in shirt size, shoe size, dress size.

• la talla = clothing size
• la mida = size/measurement/dimensions more generally

So in a sentence about a shirt being too big, la talla is the natural choice.

Examples:

• Quina talla portes? = What size do you wear?
• La mida de la taula = The size/dimensions of the table

Both can work, but la talla és massa gran is more specific. It literally says the size is too big, which is a very natural way to explain why you are returning the shirt.

If you said just:

• ...perquè és massa gran

that would mean ...because it is too big, referring to the shirt itself. That is also perfectly natural.

So the given sentence emphasizes the size rather than the shirt in general.

Here perquè means because.

In Catalan, perquè and per què are different:

• perquè = because
• per què = why / for what reason

Examples:

• No vinc perquè estic cansat. = I’m not coming because I’m tired.
• Per què no véns? = Why aren’t you coming?

The accent helps distinguish them.

Because massa means too, while molt means very.

• massa gran = too big
• molt gran = very big

In this sentence, the speaker is giving a reason for returning the shirt, so too big is the meaning needed.

Here gran means big / large.

Yes, gran can also mean old / grown-up in some contexts, but not here.

Examples:

• una camisa gran = a big shirt
• un nen gran = an older child / a grown child
• gent gran = elderly people

So the meaning depends on the noun and context.

In Catalan, adjectives often come after the noun, especially when they describe physical qualities like size, color, or shape.

So:

• una camisa gran = a big shirt
• la talla gran = the big/large size

In this sentence, the structure is:

• la talla és massa gran = the size is too big

Here gran comes after the verb és, as a predicate adjective, which is also normal.

Yes, absolutely. Voldria is often more polite and softer, like I would like to return this shirt.

Compare:

• Vull tornar aquesta camisa = I want to return this shirt
• Voldria tornar aquesta camisa = I would like to return this shirt

If you are speaking to a shop assistant, voldria may sound more polite.

Yes, it is natural and correct. It clearly explains both the action and the reason.

You could also hear similar versions such as:

• Vull tornar aquesta camisa perquè és massa gran.
• Voldria tornar aquesta camisa perquè la talla és massa gran.
• Voldria canviar aquesta camisa perquè em va massa gran.

That last one means something like I’d like to exchange this shirt because it’s too big on me.

So the original sentence is natural, but there are several equally useful ways to say it depending on the situation.

A rough guide is:

Vull tornar aquesta camisa perquè la talla és massa gran.

Approximate pronunciation:

bool tor-NAR a-KES-tuh kuh-MEE-zuh per-KEH luh TAH-yuh ez MAH-suh gran

A few helpful notes:

• vull sounds roughly like bool
• aquesta has stress on -ques-
• perquè has stress on the last syllable: per-QUÈ
• talla contains the Catalan ll, often pronounced like a y sound in many accents

Pronunciation varies across Catalan-speaking regions, but this will help you get close.