Conjunctiv in Purpose Clauses (ca să, pentru ca să)

When you do something in order to achieve a goal, Romanian builds a purpose clause on the conjunctiv. I'm studying in order to pass the exam is Învăț ca să trec examenul — "I study so-that I pass the exam." Purpose is where the conjunctiv meets one of its most useful connectors, ca să, and where you also meet a rare survival of the infinitive in the written language: pentru a + infinitive. This page sorts out when you need the full ca să, when a bare să is enough, when ca and să split apart, and when the formal infinitive is the better choice.

ca să — the default "in order to"

The all-purpose marker of purpose is ca să followed by the conjunctiv. It answers the question why? / for what purpose? and contrasts with a plain complement clause (which answers what?).

The difference between a purpose clause and an ordinary să-complement is meaning, not form. Compare:

In vreau să plec, the să-clause is the object of vreau (it tells you what is wanted). In plec ca să muncesc, the clause tells you the goal of the leaving. You can always test for purpose by inserting "in order" in English: "I'm leaving in order to work" works; "I want in order to leave" does not.

Bare să after motion verbs

After verbs of motion (a veni, a merge, a pleca, a se duce, a ieși, a trimite…), the purpose clause very often drops ca and uses a bare să. The motion already implies a goal, so the connector lightens.

You could say vin ca să te ajut — it is fully correct and slightly more emphatic about the purpose — but with motion verbs the bare să is the natural, idiomatic choice. Reserve the heavier ca să for when you want to stress the goal: Vin *ca să te ajut, nu să te critic ("I'm coming *to help you, not to criticise you").

pentru ca … să — when something comes between

Here is the rule that trips people up. The connector is fundamentally ca … să, with ca and să normally adjacent. But when something intervenes between them — typically the subject of the purpose clause, or an object pronoun belonging to it — the two pieces split, and you get the fuller, more formal pentru ca + [intervening element] + să.

The trigger for pentru ca … să is that the purpose clause has its own, different subject that needs to be named (toți, tu, el) and that subject sits between the connector and the verb. When the subject is the same as the main clause — and therefore not spelled out — you stay with the simple ca să (or bare să), because nothing intervenes.

The formal alternative: pentru a + infinitive

Purpose is one of the few corners of modern Romanian where the infinitive genuinely survives in standard use. In formal and written register, you can replace the whole ca să-clause with pentru a + short infinitive — but only when the subject is the same as the main clause. This is not an error or an archaism; it is the preferred construction in careful prose, official writing, and journalism.

In everyday speech, the same ideas come out as am venit să vă ajut and s-a întrunit ca să discute bugetul. So you have a register pair: ca să + conjunctiv (neutral/spoken) and pentru a + infinitive (formal/written). Both mean "in order to."

Negative purpose: ca să nu / pentru ca … să nu / spre a nu

Negative purpose ("so that … not / in order not to") simply adds nu before the conjunctiv verb, or before the infinitive in the formal version.

Common Mistakes

Key Takeaways

• ca să + conjunctiv is the default "in order to": învăț ca să trec.
• After motion verbs, drop ca and use bare să: vin să te ajut.
• When a different subject is named between the connector and the verb, use the full pentru ca … să: pentru ca el să înțeleagă.
• pentru a + infinitive is the correct formal/written alternative for same-subject purpose — a rare place the infinitive survives, not an error.
• Purpose answers why; an ordinary să-complement answers what.