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.

My STEPMOTHER didn't want any rivals
for her precious daughter,
Game of Thrones Season 5, Episode 6

But isn't your STEPMOTHER pregnant?
Game of Thrones Season 5, Episode 7