For children, there is a very interesting song and you can adapt the music what you want and you can dance with your pupils:
“Hello children, hello,
How are you?
-Then you can change the word children and use another words like teacher, boys, girls or the name of each pupil.
-Another greetings that you can sing and dance with this song ara: Goodbye, goodmorning or goodnight.
-Finally, we can make the following questions and answers: What’s your name? My name is ______ and How are you? I'm fine, thank you.