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.

Ah, I was, you know,
just doing my JOB.
Breaking Bad Season 2, Episode 3

I was applying
for the data-entry JOB.
Breaking Bad Season 2, Episode 7

Excuse me, no one does a better JOB
pretending to be a person than I do.
The Big Bang Theory Season 9, Episode 8

You had an acting JOB
where you got paid?
The Big Bang Theory Season 2, Episode 14

It’s a blotched JOB. You’re a bloke
with style and that’s a blotched JOB.
Money Heist Season 1, Episode 9