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.

If I catch a LIE, you lose.
Game of Thrones Season 7, Episode 6

It is forbidden to LIE with a Khal's widow.
Game of Thrones Season 6, Episode 1

You’ll excuse me, Salva, but I need
to LIE down. I need to get some sleep.
Money Heist Season 1, Episode 13

You know, l won't LIE. Um...
Breaking Bad Season 4, Episode 9

I didn't. That was a LIE.
The Big Bang Theory Season 5, Episode 20