Open this slideshow and work through each screen, page by page, with the children. By the end they should have a good understanding of what makes a limerick, and have read through four examples. You can print this slideshow too, of course.
Print out 20 limericks from Edward Lear, complete with his original funny illustrations. The booklet prints onto A4 paper and folds into an A5 booklet. Staple in the middle.