Channeling Joseph Campbell, design expert Nancy Duarte says all great speeches are in the shape of 'What is – what could be – and you call out the gap' 

Every great presentation should have a beginning, middle and end. But there needs to be a turning point between those acts.

The audience is the hero of the story. They have all the power in the room. They’ll determine your fate. The presenter is the mentor. They help the hero get unstuck, or they leave a magical tool. When someone leaves your presentation – you should be giving them something of value.