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.

Do you, Penny, take Leonard to
be your LAWFUL wedded husband?
The Big Bang Theory Season 5, Episode 13

- The LAWFUL ascension.
- What's that mean?
Game of Thrones Season 6, Episode 5

I am your son and LAWFUL heir.
Game of Thrones Season 3, Episode 1

In D&D, we're LAWFUL good,
The Big Bang Theory Season 5, Episode 19

Amy, do you take Sheldon
for your LAWFUL wedded husband?
The Big Bang Theory Season 12, Episode 24