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.

Not to MENTION
the visitors who arrive on the tongue...
The Big Bang Theory Season 4, Episode 23

But how do you MENTION bats
and leave out sonar?
The Big Bang Theory Season 8, Episode 21

Not to MENTION that the snow is so deep,
Game of Thrones Season 5, Episode 8

...not to MENTION an intricate back-story.
The Big Bang Theory Season 1, Episode 7

Did I MENTION
the PS4 controllers light up?
The Big Bang Theory Season 7, Episode 19