I would first review any specific instructions or guidelines provided by your child's teacher. If your child can get a bit creative with the report, here's an activity that provides step-by-step instructions for putting a new and different spin on the classic book report:
3rd and 4th graders will be writing more and more book reports in the coming years. Help them perfect their book report writing skills with this simple English writing practice worksheet. With this worksheet, students will get practice writing objectively as they describe the setting, characters and events of the story.