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 the husband
with the lung CANCER
Breaking Bad Season 2, Episode 1

Having CANCER
doesn't excuse all that.
Breaking Bad Season 2, Episode 4

He kept CANCER
from you for weeks.
Breaking Bad Season 2, Episode 2

His CANCER. His CANCER is back.
Breaking Bad Season 5, Episode 10

Please. Look, Junior just found
out that my CANCER is back.
Breaking Bad Season 5, Episode 11