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 one or both of them were to
confess before the TRIAL...
Game of Thrones Season 5, Episode 7

The TRIAL begins this afternoon.
Game of Thrones Season 4, Episode 6

Like reenacting the ancient German practice
of TRIAL by combat.
The Big Bang Theory Season 8, Episode 19

Though I suppose your isolation will end
when your TRIAL begins.
Game of Thrones Season 5, Episode 7

There's nothing more tedious than a TRIAL.
Game of Thrones Season 4, Episode 4