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.

...was real small. Like a BIRD.
Breaking Bad Season 3, Episode 12

It's got a big BIRD on it, dude.
The Big Bang Theory Season 2, Episode 10

You know, BIRD and mammal
in the same creature? No way.
The Big Bang Theory Season 10, Episode 20

Did you... Did you get a BIRD off
to Brienne's father in Tarth?
Game of Thrones Season 3, Episode 7

A little BIRD told us.
The Big Bang Theory Season 1, Episode 5