to know (a fact, a piece of information)
Knowing that something is the case. Very often followed by că (that) or dacă (whether).
I know it's true.
I don't know.
#36 · Verb
In Romanian, ști means “to know (a fact, a piece of information)”. It’s the #36 most frequently used Romanian word. Below you’ll find how to use it, its forms, real example sentences, and common word pairings.
a ști is "to know" — facts, skills, languages, how to do things — and the 36th most common word in Romanian. Two forms do most of the work: știu ("I know", by far the most frequent) and știi ("you know"), which also runs loose as a conversational filler. It is irregular in a small, memorable way: the stem stays ști- throughout, but the 3rd person is știe and the subjunctive is să știe.
neutralKnowing that something is the case. Very often followed by că (that) or dacă (whether).
I know it's true.
I don't know.
With să + verb it covers English "know how to" — and Romanian uses it where English would often say "can": Știu să înot = "I can swim".
I know how to cook.
Can you drive?
Languages take a bare object, no preposition: știu română, știu engleză.
Do you speak Romanian?
I don't speak French.
știi and știi tu are used exactly like English "you know" to soften or fill a pause. Extremely common in speech.
It's complicated, you know…
You know what? Let's go.
Ranked by how often each form shows up in spoken Romanian. The top 3 forms cover about 81% of everyday use — learn these first.
| Tense | eu | tu | el/ea | noi | voi | ei/ele |
|---|---|---|---|---|---|---|
| Present | știu | știi | știe | știm | știți | știu |
| Imperfect | știam | știai | știa | știam | știați | știau |
| Perfect compus | am știut | ai știut | a știut | am știut | ați știut | au știut |
| Future | voi ști | vei ști | va ști | vom ști | veți ști | vor ști |
| Conditional | aș ști | ai ști | ar ști | am ști | ați ști | ar ști |
| Subjunctive | să știu | să știi | să știe | să știm | să știți | să știe |
Nu știu unde este.
I don't know where he is.
știu - știu is the single most frequent form of the verb. Nu știu is a phrase to learn as one block on day one.
Știi să vorbești românește?
Can you speak Romanian?
știi - Skill sense: ști + să + conjugated verb. Note the double i in știi — it distinguishes "you know" from "he knows" (știe).
Nu știam că ești aici.
I didn't know you were here.
știam - For knowing in the past Romanian strongly prefers the imperfect știam over the compound past am știut — knowing is a state, not an event.
Să știi că am dreptate.
Just so you know, I'm right.
să știi - The subjunctive să știi works as a soft imperative — "note that", "be aware that". Much more common than a bare imperative.
Cine știe?
Who knows?
știe - Third-person știe. A fixed, very frequent rhetorical phrase.
Common phrases built around ști — worth learning as whole units.
lit. “not I-know”
lit. “I-know that”
lit. “you-know something”
.
I don't know what you're talking about.