Families and schools have rules to help boys and girls. Some of them think the rules are very important, but some don't think so. Sally and her cousin Jane are good students in the same school. They think rules are important in their life.
One day, Sally has a good idea—she wants to write a book of rules. She wants to help some naughty (调皮的) boys in her school. She thinks the book can help them be good students. If (如果) a boy doesn't follow the rules, he has to help his family do a thing.
Sally asks Jane for help. Sally makes some school rules like "Do homework first", "Don't be late for school". There are also some interesting rules in the book—"Don't eat other people's food" and "Be happy". Jane draws some pictures for the book.
When those naughty boys read the book, they like it very much. And they do as the book says. Their parents want to read the book, too.