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.

Although the high CONTRAST
of zebra stripes
The Big Bang Theory Season 10, Episode 10

Did you change the CONTRAST
or brightness settings on the television?
The Big Bang Theory Season 2, Episode 1