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.

He is an important fellow,
but he continues to claim he has LEGAL rights
Vikings Season 1, Episode 8

You've been frequenting drinking
establishments since you were of LEGAL age.
The Big Bang Theory Season 6, Episode 4

...feeding me LEGAL precedents,
and, if you have the strength...
The Big Bang Theory Season 3, Episode 16

the best LEGAL
representation ever.
Breaking Bad Season 2, Episode 8