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.

"So I loved making him feel NERVOUS."
Money Heist Season 1, Episode 6

and then I start apologizing
for being NERVOUS, and...
The Big Bang Theory Season 11, Episode 10

No, I changed my mind, I'd be too NERVOUS.
The Big Bang Theory Season 9, Episode 8

Nervous.
Money Heist Season 3, Episode 2

I was so NERVOUS about seeing you...
The Big Bang Theory Season 6, Episode 23