This is the 95th most frequent Romanian word.
vă
The Romanian word "vă" is a pronoun meaning "you" (plural or formal singular) in the dative or accusative case.
Here 'vă' is a polite or formal way to address someone directly in the second person plural or formally in the singular, used here as the direct object in a polite request.
Vă rog să-mi spuneți cum să ajung la gară.
Please tell me how to get to the train station.
'Vă' acts as the reflexive pronoun for the second person plural or formal singular, in this case indicating that the action of thinking is applied to the subject themselves.
Vă gândiți la concediul de vară?
Are you thinking about the summer vacation?
In this sentence, 'vă' functions as an indirect object pronoun for the second person plural or formal singular, indicating to whom the teacher is explaining the lesson.