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 don't have to lecture me
about WARTIME expenses.
Game of Thrones Season 3, Episode 5

Not easy finding molasses in WARTIME.
Game of Thrones Season 3, Episode 4