A student started this as a summary of relative clauses. I corrected her few mistakes and spruced it up a bit, but I find it to be a pretty good cheat sheet of relative clauses. Please note this is NOT an active worksheet, this is something students can use to review their comprehension. If you wanted to make it more interactive I'd reccommend deleting certain words (relative pronouns for example) and inserting blank spaces. Students could then fill it in based on their understanding. Once you reviewed the answers as a class they would have a complete and helpful cheat sheet.