Megkezdték
Megkezdték is a Hungarian verb form meaning “they began” or “they started.” It is the past definite (befejezett) form of the verb megkezdeni, created with the prefix meg- attached to kezdeni (to begin). The ending -ék marks the third-person plural in the past definite conjugation, and the sentence typically requires a definite direct object in the accusative (for example, a project or a campaign).
Megkezdték is used to report that a group of subjects initiated a specific action or process. Because
Megkezdték a kampányt. (They started the campaign.)
A projektet megkezdték tavaly. (They started the project last year.)
Megkezdték a vizsgálatot. (They began the investigation.)
Megkezdeni is the infinitive; megkezdett is the past participle form used in different constructions. The prefix