Teachers and students attend to classroom. After all lessons have finished, We say time is up. Song: It's time say to good bye, Good bye, good bye, Let's say good bye, Good bye.
Good morning is one of greeting to someone else when the time is from 00:01 - 12.00 A.M. Next, we can say good (after) noon for midday time from 12:01 til 05:30 P.M. Then, we say good evening in the dark time. We say good night if it is bed time. Song: Good morning to you,