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.

No. What l think we got here is, uh,
AHEM, Heisenberg's former cook
Breaking Bad Season 4, Episode 7

Good. Ahem. So how do you feel
your previous job experience...
The Big Bang Theory Season 8, Episode 1

Well, you know, if it is from a swirly,
there's something I can do, okay. Ahem.
The Big Bang Theory Season 2, Episode 10

...I guess I'll just have to pick it up.
Ahem.
The Big Bang Theory Season 2, Episode 9

But instead of vampires,
we had meth-heads. Ahem.
The Big Bang Theory Season 6, Episode 21