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.

You do understand
how suspicious that is to ORDINARY people?
Game of Thrones Season 3, Episode 6

And thank you, ORDINARY person.
The Big Bang Theory Season 1, Episode 4

Behold, an ORDINARY cane.
The Big Bang Theory Season 1, Episode 15

an ORDINARY
pitcher of milk.
The Big Bang Theory Season 5, Episode 12

I am willing to bet anything
that's an ORDINARY field cricket.
The Big Bang Theory Season 3, Episode 2