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.

You want an ALLERGY pill?
I have them all.
The Big Bang Theory Season 3, Episode 15

Even during ALLERGY season, when he has
to alternate between kissing and breathing?
The Big Bang Theory Season 4, Episode 24

Well, excuse me, but what did you do
when you worked on that ALLERGY drug
The Big Bang Theory Season 10, Episode 23