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.

and see how accurately
we can predict the AMPLITUDE.
The Big Bang Theory Season 11, Episode 13

Now let's
calculate the AMPLITUDE!
The Big Bang Theory Season 11, Episode 13