Romanian commonly uses că for information that someone thinks, says, or knows. Să marks the present subjunctive for an action presented as desired, necessary, possible, or evaluated rather than reported as a fact. Compare Știu că pleacă mâine. (I know that he or she is leaving tomorrow.) with Vreau să plec mâine. (I want to leave tomorrow.)
What is the difference between că and să?
Use că to connect a main clause to content that is asserted or reported, usually with a finite indicative verb. Use să to introduce the present subjunctive when the main clause presents an action as wanted, required, possible, or evaluated. This pattern can follow a verb, an adjective, or another expression. The choice depends on the meaning of the whole complement, not on a mechanical English word-for-word translation.
| What the complement does | Typical pattern | Example |
|---|---|---|
| Reports information or a belief | main-clause verb + că + finite clause | Cred că trenul ajunge la opt. (I think the train arrives at eight.) |
| Expresses desire, need, or possibility | main-clause expression + să + subjunctive | Trebuie să plecăm acum. (We have to leave now.) |
| Makes a subject or another clause element explicit or prominent | ca + clause element + să + subjunctive | Vreau ca Ana să plece. (I want Ana to leave.) |
When do you use că?
Use că after many verbs of saying, thinking, knowing, discovering, and reporting. The clause after că supplies the content: Mihai a spus că ajunge la prânz. (Mihai said that he would arrive at noon.) Am aflat că muzeul este închis. (I found out that the museum is closed.) Este clar că avem nevoie de timp. (It is clear that we need time.)
The conjunction că does not force the verb in its clause into one tense. Choose the tense that expresses the intended time relation: Ana a spus că lucrează de acasă. (Ana said that she works from home.) versus Ana a spus că va lucra de acasă. (Ana said that she would work from home.) Romanian reported clauses use a wider tense contrast; see sequence of tenses.
When do you use să?
Use să as the marker of the present subjunctive in a complement clause. Common triggers express desire, necessity, possibility, or evaluation.
| Trigger meaning | Example |
|---|---|
| Desire | Vreau să învăț. (I want to learn.) |
| Necessity | E important să verifici datele. (It is important that you check the data.) |
| Possibility | Este posibil să plouă. (It is possible that it will rain.) |
| Evaluation | Îmi place să citesc seara. (I like reading in the evening.) |
The subordinate subject can match or differ from the main-clause subject. Compare how the verb ending or an explicit subject identifies the subordinate subject. Romanian can use să directly with a different subject. Use ca…să when that subject needs special clarity or focus.
| Subject pattern | Romanian example | Meaning |
|---|---|---|
| Main and subordinate subjects are the same | Sper să ajung la timp. | I hope to arrive on time. |
| A different subject is understood from the verb ending | Sper să ajungi la timp. | I hope you arrive on time. |
| A different subject is stated or focused | Sper ca Maria să ajungă la timp. | I hope Maria arrives on time. |
The form after să is a subjunctive form, not an English-style infinitive. In the first and second persons, it often looks like the present indicative. Context and să identify it as subjunctive: lucrez (I work) but vreau să lucrez (I want to work). Third-person forms can differ: pleacă (he or she leaves) but vrea să plece (he or she wants to leave). See the Romanian present subjunctive for formation and placement of pronouns such as să-i spun (to tell him or her).
How does the meaning change when both are possible?
Some expressions can take either kind of complement, but the meaning changes. Mă bucur că ai venit. (I am glad that you came.) presents your arrival as the fact that gives me pleasure. Mă bucur să te văd. (I am glad to see you.) presents seeing you as the action I am happy to experience. Likewise, Știu că înoată. (I know that he or she swims.) reports knowledge of a fact, while Știu să înot. (I know how to swim.) says that I have the ability.
When is să not a complement marker?
Not every să marks a complement clause. The common future construction o să appears in O să ajung la șase. (I will arrive at six.) See the future with o să. The purpose marker ca să appears in Am venit ca să te ajut. (I came in order to help you.) See purpose clauses with ca să.
How do e, este, and future forms vary by register?
Conversational Romanian commonly uses e alongside the neutral and more formal-sounding este. Both Cred că e târziu. (I think it is late.) and Cred că este târziu. (I think it is late.) are standard. The o să future is neutral and especially frequent in speech: Sper că o să ajungi la timp. (I hope you will arrive on time.) The alternative Sper că vei ajunge la timp. can sound more deliberate or formal. These are register or construction choices, not replacements of că with să.
Mistakes to avoid
- Do not use că after a desire or requirement just because English uses “that”: say Vreau să plec, not Vreau că plec.
- Do not leave out să after ca when ca…să introduces a focused subjunctive clause: say Vreau ca Ana să plece, not Vreau ca Ana plece.
- Do not confuse că with ca. Că introduces content in Știu că ai dreptate. (I know that you are right.) Ca is part of patterns such as ca să and ca Ana să….
- Do not assume that că always means past or that complement-clause să always means future. Că can introduce clauses in different tenses. Complement-clause să marks the subjunctive.
Which sentence means “I know that Ana is at home”?
- Știu să fie Ana acasă.
- Știu că Ana este acasă.
- Știu ca Ana să fie acasă.
- Știu Ana să fie acasă.
Că introduces the information that Ana is at home. Să would make the clause subjunctive, and ca…să is used for a focused subjunctive complement, not for ordinary knowledge of a fact.
Complete the neutral sentence: Vreau ___ plec acum.
- să
- că
- ca
- o să
Vreau să plec expresses the speaker’s desire to leave. Că introduces reported content. Bare ca cannot fill this gap; it belongs to patterns such as ca tu să pleci. O să is a future construction.
Which sentence says “I want Maria to leave early”?
- Vreau că Maria pleacă devreme.
- Vreau să Maria plece devreme.
- Vreau ca Maria să plece devreme.
- Vreau ca Maria pleacă devreme.
The explicit-subject pattern is ca Maria să plece. The verb after să is subjunctive. Că would report information, while ca Maria pleacă uses an indicative form where the subjunctive is required.
Which sentence says “I am glad that you came,” presenting your arrival as a fact?
- Mă bucur să vii.
- Mă bucur ca tu vii.
- Mă bucur să te văd.
- Mă bucur că ai venit.
Mă bucur că ai venit uses că to present the completed arrival as the fact that causes the speaker’s happiness. The să options use a subjunctive complement and do not present that completed arrival as a fact.
Which sentence uses să inside the common future construction, rather than introducing a complement clause?
- Sper să reușesc.
- O să reușesc.
- Vreau să reușesc.
- Este important să reușesc.
In O să reușesc, o să is a common future construction. In the other sentences, să reușesc is the subjunctive complement selected by sper, vreau, or este important.