Re: The meaning of "school play"
Many children have their first (and last) great dramatic performance as, say, a duck or a tree in their school play in elementary school. I believe I was "Santa's Elf #3" in my first great performance and my line was something like "Imagine trying to use spearmint to repair a candy cane!" or something like that.
My dramatic line in high school I remember more clearly. I said "Or Geroge! And Phyllis!" (I moved into the pit orchestra after that. It was more fun.)
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.