The first step in learning to paraphrase is to learn to recognize it! This PowerPoint lesson illustrates the difference between paraphrasing and plagiarizing. Students are given a handout with examples (which are also on the PowerPoint). They compare the "paraphrasing" to the original text to determine if the samples are paraphrased or plagiarized. There are two examples of good paraphrasing and two examples of plagiarism. Text excerpts are taken from a middle school history textbook.
This download includes a PowerPoint presentation, a PDF student handout, and a PDF containing links to both the presentation and student handout on Google docs (for easy editing). A PDF of the PowerPoint is also included.
You may read more about how I've used this presentation on my blog: http://www.imrunningonfumes.com/?p=1415