Quan tinc set, prefereixo aigua, però la meva amiga també vol te.

Because set in Catalan is a noun here, meaning thirst, not an adjective.

So:

• tenir set = to be thirsty
  literally: to have thirst

This works like:

• tinc gana = I’m hungry
• tinc por = I’m afraid
• tinc son = I’m sleepy

So Quan tinc set means When I’m thirsty.

Quan means when.

In this sentence, Quan tinc set uses the present tense because it expresses a general habit or repeated situation:

• Quan tinc set, prefereixo aigua
  = When I’m thirsty, I prefer water

This is similar to English using the present for general truths or routines.

Catalan can also use quan with other tenses depending on context, for example in past or future situations, but here the present is the natural choice because it describes what usually happens.

Catalan often drops subject pronouns because the verb ending already shows who the subject is.

• tinc = I have
• prefereixo = I prefer
• vol = he/she wants

So Catalan normally says:

• Tinc set
• Prefereixo aigua

rather than:

• Jo tinc set
• Jo prefereixo aigua

You can include jo for emphasis or contrast, but it is not usually necessary.

Prefereixo is the 1st person singular present tense of preferir (to prefer).

So:

• jo prefereixo = I prefer
• tu prefereixes = you prefer
• ell/ella prefereix = he/she prefers
• nosaltres preferim = we prefer
• vosaltres preferiu = you all prefer
• ells/elles prefereixen = they prefer

A learner may notice that prefereixo does not look exactly like the infinitive preferir. That is normal: this verb has a stem change in some forms.

In Catalan, when talking about drinks or food in a general, indefinite way, it is very common to use the noun without an article.

So:

• prefereixo aigua = I prefer water
• vol te = she also wants tea

This is similar to English, where we also usually say I prefer water, not I prefer the water, unless we mean a specific water.

If you were talking about something specific, an article could appear:

• Prefereixo l’aigua freda = I prefer the cold water
• Vol el te que has preparat = She wants the tea you made

Catalan usually uses the definite article before a possessive and a noun:

• la meva amiga = my friend
• el meu germà = my brother
• els nostres llibres = our books

This is different from English, which does not use the in phrases like my friend.

So the normal Catalan pattern is:

• article + possessive + noun

There are a few exceptions, especially with some family terms in certain contexts, but la meva amiga is completely standard.

Because amiga is a feminine singular noun, and the possessive must agree with it.

So:

• el meu amic = my male friend
• la meva amiga = my female friend

Agreement happens in gender and number:

• meu = masculine singular
• meva = feminine singular
• meus = masculine plural
• meves = feminine plural

També means also or too.

In this sentence:

• la meva amiga també vol te
• My friend also wants tea

Its placement before the verb is very natural in Catalan. It usually goes near the part of the sentence it modifies, and placing it before the verb is common.

Compare:

• També vol te = She also wants tea
• La meva amiga també vol te = My friend also wants tea

In English, also can move around a bit too, but Catalan has its own typical word order.

Vol is the 3rd person singular present tense of voler (to want).

So:

• jo vull = I want
• tu vols = you want
• ell/ella vol = he/she wants
• nosaltres volem = we want
• vosaltres voleu = you all want
• ells/elles volen = they want

Here it refers to la meva amiga, so vol means she wants.

Because Quan tinc set is an introductory subordinate clause.

So the sentence is structured like this:

• Quan tinc set, = When I’m thirsty,
• prefereixo aigua = I prefer water

Using a comma here is standard and makes the sentence easier to read.

Then però introduces a new coordinated clause:

• però la meva amiga també vol te
  = but my friend also wants tea

Però means but, and it is written with a grave accent: ò.

This accent is part of the standard spelling of the word. It also helps distinguish it visually from other similar-looking forms and indicates the stressed vowel.

So always write:

• però = but

not:

• pero

Yes, but it is not exactly the same structure.

• Prefereixo aigua = I prefer water
• M’agrada més l’aigua = I like water more / I prefer water

Both can express preference, but preferir is the more direct verb for to prefer.

Also notice that with agradar, Catalan works differently:

• M’agrada l’aigua = I like water
  literally closer to: Water pleases me

So a learner should not treat preferir and agradar as interchangeable in structure, even if the overall meaning can sometimes overlap.

Because Catalan often keeps things economical when the subject is obvious.

In the sentence:

• prefereixo aigua → the ending -eixo shows the subject is I
• la meva amiga també vol te → the noun la meva amiga is explicitly stated, so no pronoun is needed

Catalan avoids unnecessary pronouns more than English does. This is one of the most important habits for English speakers to get used to.

In Catalan:

• te = tea
• té = he/she has

So the accent makes an important difference.

In this sentence:

• vol te = wants tea

No accent is used because this is the noun tea, not the verb has.

This is a useful contrast:

• La meva amiga té set = My friend is thirsty
• La meva amiga vol te = My friend wants tea

The given sentence is very natural, but Catalan word order can sometimes shift for emphasis.

Standard neutral version:

• Quan tinc set, prefereixo aigua, però la meva amiga també vol te.

Possible variations:

• Quan tinc set, jo prefereixo aigua, però la meva amiga també vol te.
  Adding jo gives emphasis or contrast.

• La meva amiga també vol te, però jo prefereixo aigua quan tinc set.
  This changes the focus.

So the original version is a normal, neutral sentence, but other orders are possible depending on what you want to emphasize.