This song uses C and C7. The TAB isn’t too challenging either.
It is a singing game; Singer 1 (was the previous singer 2) and Singer 2 (Henry) take turns, and the rest of the group join in at the end. In this version, Singer 2, Henry, has chosen Becca.
Next time round, Henry is now Singer 1, and Becca becomes Singer 2. Becca will choose a new person.
Third time round, Becca becomes Singer 1 and the new person becomes Singer 2. It’s much easier to do it than explain it!
I teach the whole song through, and then do the game once everyone knows all the song.