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.

I'm filling out the ONLINE registration
for your game.
The Big Bang Theory Season 2, Episode 3

So I looked it up ONLINE and showed him.
The Big Bang Theory Season 6, Episode 6

Here. Try and go ONLINE.
The Big Bang Theory Season 2, Episode 7

Stuart and I are putting
dating profiles ONLINE,
The Big Bang Theory Season 7, Episode 4

No, it's not. Not at all.
Yes, it is. l read ONLINE.
Breaking Bad Season 4, Episode 6