I frequently stress to students that reading for tone is the single most important skill they can develop to improve their reading abilities. (And I truly believe that.) Being able to think abstractly and extrapolate a speaker or writer's attitude from their word choices, sentence structures, and use of metaphorical & literal language helps students to push beyond comprehension to deeper, more complex understandings.
With that philosophy in mind, this is a brief overview of how to read for tone for students. One side provides an explanation of how tone works, with examples of how tone changes due to diction, imagery, details, and syntax. The other side then provides space for students to apply these ideas to their own readings; you can easily tweak the language to apply this to short fiction, nonfiction, poetry, or any other text.