Download ONLY if you use Mac OSX. These files require Apple Keynote. If you are a Windows Person download the Windows (powerpoint) version.
I use these to teach verb tenses (there are 12 powerpoint files compressed in this file) to my ESL students.
I have set them up to not merely teach tenses but with an eye to using them in the real world. These files are in keynote format. I offer this for Mac people because the transitions in Keynote are nicer.