What makes a good or a bad academic oral presentation? This video will enable you to see both, so you can compare them. Forward to the 01:16 point to view the presentations.
If you'd like more explanations and exercises, have a look at the English for Uni site (http://www.adelaide.edu.au/english-for-uni/oral-presentation/).
This video was funded by a Flinders University Teaching and Learning Innovation Grant, and is uploaded with permission from Flinders University, Adelaide, Australia, who own copyright together with the author, Julia Miller.