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.

...and is also home
to a delightful SQUIRREL...
The Big Bang Theory Season 6, Episode 9

What are you looking at,
you stupid SQUIRREL?
The Big Bang Theory Season 6, Episode 9

(SQUIRREL CHITTERING)
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(SQUIRREL CHITTERING)
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(SQUIRREL CHITTERING)
The Big Bang Theory Season 6, Episode 9