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.

You'd either have to break your
hip or let Howard KNOCK you up.
The Big Bang Theory Season 11, Episode 12

...and they KNOCK a few bucks
off her price.
Breaking Bad Season 3, Episode 12

...motivating you to go back
and KNOCK me unconscious.
The Big Bang Theory Season 1, Episode 14

Knock.
Breaking Bad Season 4, Episode 4

(KNOCK ON DOOR)
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(KNOCK ON DOOR)
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(KNOCK ON DOOR)
The Big Bang Theory Season 4, Episode 7