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.

Should I fail to PERSUADE
the Blackfish to surrender
Game of Thrones Season 6, Episode 8

If you let me talk to him,
I will PERSUADE him to honor his pledge.
Vikings Season 1, Episode 7

Let me try to PERSUADE the Blackfish
to give up the castle.
Game of Thrones Season 6, Episode 8

You don't need to PERSUADE me.
Game of Thrones Season 6, Episode 5

How did my sweet sister PERSUADE the king
to imprison his dear friend Ned?
Game of Thrones Season 1, Episode 8