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.

...because you can't CONCEIVE of something
that you are not an expert in.
The Big Bang Theory Season 2, Episode 9

His mother was human. His father
was Vulcan. They couldn't CONCEIVE.
The Big Bang Theory Season 1, Episode 13

Surprised he let us CONCEIVE without him.
The Big Bang Theory Season 9, Episode 20

make me CONCEIVE again
Vikings Season 1, Episode 8