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.

who is at the HELM with no doubt,
Money Heist Season 1, Episode 6

You may remove your HELM.
Game of Thrones Season 1, Episode 8

Rise. Remove your HELM.
Game of Thrones Season 2, Episode 3

I've got my Helm of Lordly Might,
my Boots of Speed...
The Big Bang Theory Season 6, Episode 23