take for example

When the athletes appeared, the referee introduced: on my left, it was XXX from XX, and on my right, it was XXX from XX.

At the beginning of the game, the referee first reported: zero to zero. Play (start the game)

Report to the change server when changing the service.

When you hit the last point of a game, report to gamepoint.

When a game hits the last point, report to gamepoint.

. . . . .

There are many badminton referees' teaching materials on the Internet. I'll understand everything after downloading.