가 시작됩니다

… begins / … is starting

→ 가
phrase Rare #16,939
… begins / … is starting 가 marks the subject, and 시작됩니다 is a polite, formal way to say “begins” or “starts.”
KO: 쇼가 시작됩니다!
EN: The show is starting!

저녁 식사가 시작됩니다

Dinner is being served.

— 레오파드 (1963)

곧 쇼가 시작됩니다!

The show is about to start!

— 패왕별희 (1993)