This is a grammar practice I employed to practice possible form with year 11 students. There were only 5 students (1 boy and 4 girls). At that time, they were less motivated and they were likely to say “I don’t know” “I don’t understand” without trying. So I was looking for something which could motivate them.
I got them to choose one animal they like, and to write a sentence they can do using possible form. e.g. "kujira wa utaemasu (Whales can sing)." They looked excited and worked well for this task.