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 believe I would
like to ALTER
The Big Bang Theory Season 5, Episode 10

to ALTER my personality.
The Big Bang Theory Season 7, Episode 16

You must convince
the gods to ALTER the runes
Vikings Season 1, Episode 1

But you cannot ALTER my fate!
Vikings Season 1, Episode 6