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.

Yeah, and if you wanna stay a criminal
and not become, say, a CONVICT...
Breaking Bad Season 3, Episode 9

No jury would CONVICT us
because people love monkeys.
The Big Bang Theory Season 4, Episode 21