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.

Yeah, but that's the very reason
we need to NEGOTIATE.
Breaking Bad Season 4, Episode 3

They're neutralizing the best bargaining
chip we have to NEGOTIATE for Rio.
Money Heist Season 3, Episode 6

Aye, gone to the Crag, but not to NEGOTIATE.
Game of Thrones Season 2, Episode 7

to NEGOTIATE with his father,
and I ignored your advice.
Game of Thrones Season 3, Episode 9

So I advise to NEGOTIATE and wait.
Money Heist Season 1, Episode 5