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.

I sent her to INTERROGATE Aníbal Cortés.
Money Heist Season 3, Episode 3

After we INTERROGATE 'em, we usually just...
Game of Thrones Season 2, Episode 4

before they send forensic doctors
to INTERROGATE him
Money Heist Season 3, Episode 6

And to do that,
we will INTERROGATE every hostage!
Money Heist Season 3, Episode 7