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.

By the time you were born,
your father's austerity had become HERS.
Game of Thrones Season 4, Episode 5

Think when she and I had that conversation
she left people off HERS?
The Big Bang Theory Season 8, Episode 4

Whatever is HERS is also mine.
Game of Thrones Season 1, Episode 6

- Stop! Arya!
- She's as wild as that animal of HERS.
Game of Thrones Season 1, Episode 2

it transmits exactly
what you're doing to HERS.
The Big Bang Theory Season 5, Episode 2