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.

Ten drops, HOWEVER...
Game of Thrones Season 2, Episode 9

However...
Money Heist Season 3, Episode 3

"However, there is some good news."
Money Heist Season 1, Episode 8

HOWEVER stupid his god is.
Vikings Season 1, Episode 3

However briefly.
The Big Bang Theory Season 1, Episode 1