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.

Don't you care if
the negotiations FAIL?
Vikings Season 1, Episode 9

Bit of a quandary for you.
If you kill me, you FAIL Lady Stark.
Game of Thrones Season 3, Episode 2

If I FAIL, I FAIL. If I pass, I pass.
Do you get it?
The Big Bang Theory Season 6, Episode 6

If they FAIL on the battlefield,
Game of Thrones Season 3, Episode 3

where did I FAIL as a father?
The Big Bang Theory Season 10, Episode 16