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.

No tissue damage WHATSOEVER.
The Big Bang Theory Season 3, Episode 3

I'd rather people not know I have any
prior connection to you WHATSOEVER.
The Big Bang Theory Season 4, Episode 2

No lumbar support WHATSOEVER.
The Big Bang Theory Season 2, Episode 1

With the understanding
that nothing changes WHATSOEVER,
The Big Bang Theory Season 5, Episode 10