CPPF, if lots of people are doing powerpoint, and especially because the subject is English, I would suggest that you don't use it. It tends to be the case that whats on the powerpoint is just what you are saying, but this detracts attention from the speaker and unfortunately since a speech cannot be perfect, but writing can, it will make you look worse!
Instead, you could have key quotes written on a flip-chart while you explain them, or just spend the time you are using on making a powerpoint to construct a REALLY good speech

Good luck