Prey:you and some classmates are going to play:"The Three Pigs".You are one of the pigs.
Pred:you and some classmates are going to play:"The Three Pigs".You are the Wolf

Prey:you and some classmates play:"Little Red Riding Hood".You play as her
Pred:you and some classmates play:"Little Red Riding Hood".You play as the Wolf

Prey:just pick a play and be the prey
Pred:pick play be pred