Catalan perquè has two central uses that English writes with different words. With the indicative, it commonly means because and gives a cause: Tanco la finestra perquè fa fred. With the subjunctive, it means so that / in order that and gives an intended result: Tanco la finestra perquè no entri fred. Mood is what allows the same conjunction to connect two very different logical relationships.
A purpose is not asserted as an achieved fact. It is the goal toward which someone acts, and that nonasserted status explains the subjunctive more deeply than simply memorizing “perquè can mean so that.”
The core contrast: cause versus purpose
A causal clause looks backward and explains why the main event happens. A purpose clause looks forward and explains what result the main event is meant to produce.
He encès el llum perquè no hi veia.
I turned on the light because I couldn't see.
He encès el llum perquè hi vegis millor.
I turned on the light so that you can see better.
Parla fluix perquè el nen dorm.
She is speaking quietly because the child is asleep.
Parla fluix perquè el nen no es desperti.
She is speaking quietly so that the child doesn't wake up.
In the causal examples, no hi veia and el nen dorm are offered as facts that motivate the action. In the purpose examples, seeing better and not waking up are desired outcomes, not claims that those outcomes already hold.
Purpose often involves a different subject
A finite purpose clause is especially useful when the person carrying out the main action and the person expected to realize the goal are different. The subjunctive ending makes the second subject clear.
T'he enviat l'adreça perquè no et perdis.
I sent you the address so that you don't get lost.
Deixarem la clau a recepció perquè la pugueu recollir aquesta nit.
We'll leave the key at reception so that you can pick it up tonight.
La tutora repeteix les instruccions perquè tothom les entengui.
The tutor repeats the instructions so that everyone understands them.
The subjects are respectively jo / tu, nosaltres / vosaltres, and la tutora / tothom. English uses modal verbs such as “can” or an unmarked present; Catalan uses person-number inflection in the subjunctive.
An explicit subordinate subject may come before or after its verb according to information structure:
Hem canviat l'hora perquè hi pugui assistir la directora.
We changed the time so that the director can attend.
The weak pronoun hi precedes pugui, while the heavier subject la directora follows it. Reordering does not change the mood or agreement.
When the subject stays the same
When one person both acts and pursues the goal, Catalan normally prefers an infinitival purpose phrase. Per tal de + infinitive is unambiguous and works well in careful speech and writing; simple per + infinitive is also widespread.
He apagat el mòbil per tal de concentrar-me.
I turned off my phone in order to concentrate.
Van sortir d'hora per evitar les cues.
They left early to avoid the queues.
Compare a changed subject:
He apagat el mòbil perquè ningú no em molesti.
I turned off my phone so that nobody bothers me.
Using perquè + subjunctive with the same subject is possible when the speaker wants a fully finite clause or needs to foreground a circumstance, but the infinitive is normally shorter and more idiomatic: Treballo des de casa per estalviar temps is more natural than treballo des de casa perquè estalviï temps when the understood saver is “I.”
Catalan has recognized regional systems for choosing per and per a before infinitives. Valencian standard uses per a + infinitive more broadly (regional: Valencian), whereas Central usage often has per + infinitive when an intentional agent performs the action (regional: Central). Per tal de and a fi de avoid this particular alternation. This regional choice does not affect finite perquè + subjunctive.
Alternative purpose conjunctions and register
Per tal que and a fi que also introduce finite purpose clauses and take the subjunctive. They make the purposive relationship explicit and are especially common in instructions, administration, and planned formal prose (formal). Everyday conversation normally favors perquè (informal/neutral).
Adjunteu una còpia del passaport per tal que puguem tramitar la sol·licitud.
Attach a copy of the passport so that we can process the application.
S'ha ampliat el termini a fi que totes les entitats hi puguin participar.
The deadline has been extended so that all the organizations can participate.
Do not create per a que. Before a finite clause, standard Catalan uses perquè, per tal que, or a fi que. The space and accent distinctions also matter: perquè is the conjunction; per què? asks “why?”; per a què? asks “what for?”
Purpose does not imply success
Because a purpose is merely intended, a later clause can explicitly say that the result failed without contradiction.
Li vaig escriure perquè vingués, però ni tan sols va llegir el missatge.
I wrote to her so that she would come, but she didn't even read the message.
This past example uses the imperfect subjunctive vingués because the controlling action vaig escriure is in the past. With a present, future, or imperative main clause, the present subjunctive is normal:
Escriu-li perquè vingui demà.
Write to her so that she comes tomorrow.
The timeline selects vingui versus vingués; the purposive relation selects subjunctive in both. See past-time dependency for sequence of tense.
Negation and weak pronouns
Negation belongs before the weak-pronoun cluster and the finite subjunctive. It can negate the desired result without changing the purposive relation.
Tanca la porta perquè no ens sentin.
Close the door so that they don't hear us.
Ho he apuntat perquè no se me n'oblidi.
I've written it down so that I don't forget it.
In no se me n'oblidi, se and en realize pronominal oblidar-se d'una cosa, while me marks the affected experiencer. Singular oblidi agrees with the understood thing not to be forgotten. Pronoun placement follows the ordinary finite-clause pattern; perquè does not pull pronouns toward itself.
Mini-dialogue: preparing an online meeting
—T'envio l'enllaç ara perquè el tinguis a mà. —Perfecte; també avisaré la Joana perquè s'hi connecti cinc minuts abans.
—I'm sending you the link now so that you have it handy. —Perfect; I'll also tell Joana so that she connects five minutes early.
—Per què hi entrarem abans? —Perquè hem de comprovar el so, i perquè ningú no ens hagi d'esperar.
—Why are we going in early? —Because we need to check the sound, and so that nobody has to wait for us.
The reply deliberately contains both values: causal perquè hem de comprovar uses indicative, while purposive perquè ningú no ens hagi d'esperar uses subjunctive.
Common Mistakes
1. Using the indicative for an intended result.
❌ T'ho explico perquè ho entens.
Incorrect for the intended meaning—indicative makes this sound causal: because you understand it.
✅ T'ho explico perquè ho entenguis.
I'm explaining it to you so that you understand it.
2. Using the subjunctive for an asserted cause.
❌ Ens hem quedat a casa perquè plogui.
Incorrect for a factual cause—the rain is being given as the reason.
✅ Ens hem quedat a casa perquè plou.
We've stayed home because it's raining.
3. Building a finite clause with per a que.
❌ T'ho envio per a que ho revisis.
Incorrect in standard Catalan—do not use per a que before a finite clause.
✅ T'ho envio perquè ho revisis.
I'm sending it to you so that you can review it.
4. Repeating the same subject unnecessarily.
❌ He vingut perquè jo parli amb la responsable.
Unnatural as a neutral same-subject purpose; the explicit finite clause adds needless contrast.
✅ He vingut per parlar amb la responsable.
I've come to speak with the person in charge.
5. Using a present subjunctive after a past controlling action.
❌ Vaig tancar la finestra perquè no entri fred.
Incorrect for a purpose simultaneous with that past action.
✅ Vaig tancar la finestra perquè no entrés fred.
I closed the window so that cold air wouldn't come in.
Key Takeaways
- Causal perquè asserts a reason and normally takes indicative; purposive perquè presents an intended result and takes subjunctive.
- A changed subject strongly favors a finite purpose clause; a shared subject normally favors an infinitive.
- Use perquè, per tal que, or a fi que before a finite clause, never per a que.
- Purpose does not imply success.
- Present or past perspective selects present vingui versus imperfect vingués; purpose selects the subjunctive mood itself.
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- Subjunctive after Wishes and InfluenceB1 — Use the Catalan subjunctive after wanting, requesting, requiring, allowing, and preventing, with the right subject structure.
- Future Time Clauses and the SubjunctiveB1 — Present pending future events after quan, fins que, tan bon punt, and abans que with the appropriate Catalan mood and tense.
- Past-Time Subjunctive in Dependent ClausesB1 — Use the imperfect subjunctive after past wishes, emotions, evaluations, doubts, and influence while preserving time relations and assertion contrasts.
- Purpose ConnectorsA2 — Express intended outcomes with perquè plus the subjunctive and with per tal de, per tal que, and a fi de while tracking who performs each action.
- Indicative or Subjunctive?B1 — Choose Catalan indicative or subjunctive by deciding whether a clause is asserted or placed inside desire, evaluation, nonidentification, or another nonassertive frame.