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.

any CRIMINAL activity
you were a witness or a party to.
Breaking Bad Season 5, Episode 12

My father says a CRIMINAL is a CRIMINAL.
Game of Thrones Season 4, Episode 3

The Earl
will deal with some CRIMINAL offenses,
Vikings Season 1, Episode 1

I'm a CRIMINAL, yo.
Breaking Bad Season 3, Episode 9

It is because of you
that I now have a CRIMINAL record.
The Big Bang Theory Season 3, Episode 16