The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

I don't need to see your PRESENTATION.
This discussion is over.
The Big Bang Theory Season 3, Episode 15

Howard, could you lower the lights?
I have a short PowerPoint PRESENTATION.
The Big Bang Theory Season 3, Episode 15

Please hold all questions
until the end of the PRESENTATION.
The Big Bang Theory Season 3, Episode 15

What PRESENTATION
do I have today?
The Big Bang Theory Season 7, Episode 10

...in this brief PowerPoint PRESENTATION.
Ahem. Lights.
The Big Bang Theory Season 3, Episode 15