Do you want to teach them about presentations in general, or about using PowerPoint in particular? They are intermediate PP users, or intermediate English speakers?
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I just googled "tips on creating powerpoint presentations" - I haven't read any of them so I don't know how good/bad they are.
I'd start with planning the presentation, analyzing the messages that they want to convey, the audience, etc. Before they even touch the keyboard, know who they are talking to, what they want the audience to do with the message, and then what the messages are, a