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.

- Theon? He's a good LAD.
- I doubt it.
Game of Thrones Season 1, Episode 4

Good LAD.
Game of Thrones Season 7, Episode 6

I have no hatred for the LAD.
Game of Thrones Season 2, Episode 4

already a big LAD,
already getting a bit of a reputation.
Game of Thrones Season 1, Episode 4

As you wish, LAD.
Game of Thrones Season 1, Episode 7