La noia de la samarreta blava treballa a la botiga.

La is the feminine singular definite article, equivalent to the.

It appears three times because there are three feminine singular nouns:

• la noia = the girl
• la samarreta = the T-shirt
• la botiga = the shop

Catalan articles must agree with the noun in gender and number, so la is used each time here.

Noia usually means girl or young woman.

Depending on context, it can also mean girlfriend, but not here. In this sentence, it clearly means the girl / the young woman because the rest of the sentence is just describing her and saying where she works.

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

Here, blava describes samarreta, and samarreta is feminine singular. So the adjective also has to be feminine singular:

• blau = blue, masculine singular
• blava = blue, feminine singular
• blaus = blue, masculine plural
• blaves = blue, feminine plural

So:

• la samarreta blava = the blue T-shirt

In Catalan, adjectives often come after the noun, much more often than in English.

So:

• la samarreta blava literally follows the pattern the T-shirt blue
• natural English reverses that to the blue T-shirt

This noun + adjective order is very normal in Catalan.

Literally, it means of the blue T-shirt, but in natural English we would usually say something like:

• the girl in the blue T-shirt
• the girl with the blue T-shirt

In Catalan, de + article + noun phrase can be used to identify someone by a visible characteristic. So la noia de la samarreta blava means the girl with/in the blue T-shirt, not that the T-shirt belongs to her in some special possessive sense.

Yes, amb la samarreta blava is also possible and would very naturally mean with the blue T-shirt / wearing the blue T-shirt.

There is a slight difference in feel:

• la noia de la samarreta blava = identifying her as the girl in the blue T-shirt
• la noia amb la samarreta blava = emphasizing that she is with/wearing the blue T-shirt

Both are understandable, but de la samarreta blava is a common descriptive way to pick out which girl you mean.

Treballa is the third-person singular present form of the verb treballar, which means to work.

So:

• jo treballo = I work
• tu treballes = you work
• ell/ella treballa = he/she works

In this sentence, the subject is la noia, which is third-person singular, so treballa is the correct form.

Because Catalan often leaves subject pronouns out when the verb ending already makes the subject clear.

So instead of saying:

• Ella treballa a la botiga

Catalan can simply say:

• La noia ... treballa a la botiga

This is very normal. Catalan is a pro-drop language, like Spanish or Italian, so subject pronouns are often omitted unless they are needed for emphasis or contrast.

The preposition a is used here with la botiga to mean at the shop or in the shop, depending on the context.

So:

• a = at / in / to
• la botiga = the shop
• a la botiga = at the shop / in the shop

Also, a + la does not contract in Catalan. So it stays a la.

Compare:

• a + el = al
• a + la = a la

It can mean either, and English chooses the most natural option depending on context.

In Catalan, treballar a a place is very common. So:

• treballa a la botiga = she works at the shop / she works in the shop

Both are good translations. English often prefers at the shop when talking generally about someone’s workplace, but in the shop can also fit.

The sentence follows a very normal Catalan pattern:

• La noia de la samarreta blava = the subject
• treballa = the verb
• a la botiga = a prepositional phrase telling where she works

So the structure is basically:

Subject + Verb + Place

That is the same broad order English uses in: The girl in the blue T-shirt works at the shop.

A simple learner-friendly pronunciation is roughly:

truh-BAH-yuh

A few useful notes:

• the stress is on the ba syllable: tre-BA-lla
• the ll in many varieties of Catalan sounds like the lli in million, though pronunciation can vary by region
• the final a is a soft vowel sound

You do not need perfect regional pronunciation right away; the important thing is recognizing that treballa is one word and the stress is in the middle.