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.

They're going to digitally ADD
a supernova.
The Big Bang Theory Season 2, Episode 4

Add a belt and I'll take you someplace nice.
The Big Bang Theory Season 8, Episode 22

But I had him ADD clothes,
'cause I thought
The Big Bang Theory Season 5, Episode 17

- We ADD Bluetooth.
- Oh.
The Big Bang Theory Season 2, Episode 18