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.

this is
a sexy French maid costume
The Big Bang Theory Season 5, Episode 21

It's French for "good shower."
The Big Bang Theory Season 1, Episode 1

(SPEAKS IN FRENCH)
"
title="
(SPEAKS IN FRENCH)
"
style="width: 100%;padding-left: 0px; padding-top: 0px;border: 0;"
width="100%" loading="lazy">
(SPEAKS IN FRENCH)
The Big Bang Theory Season 1, Episode 1

lf l recall, at least from
the first French Connection,
Breaking Bad Season 4, Episode 4

You can throw all the French around
you want, it doesn't make you right.
The Big Bang Theory Season 2, Episode 20