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.

Plus, if I do a good job,
The Big Bang Theory Season 7, Episode 1

Plus, I think I'm setting
a good example for Halley,
The Big Bang Theory Season 10, Episode 20

Plus, I haven't watched
Star Trek
The Big Bang Theory Season 5, Episode 17

On the PLUS side, it was a good kiss,
reasonable technique...
The Big Bang Theory Season 1, Episode 3

- Plus, there's that big nose of his.
- That's not a nose, that's a horn.
Breaking Bad Season 3, Episode 13