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.

A big OPPORTUNITY.
Breaking Bad Season 2, Episode 5

which gives you an OPPORTUNITY to show her
The Big Bang Theory Season 10, Episode 23

So me and the guys were talking
about this great investment OPPORTUNITY...
The Big Bang Theory Season 8, Episode 4

LEONARD: Thank you so much for
giving me the opportunity to help.
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LEONARD: Thank you so much for
giving me the opportunity to help.
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LEONARD: Thank you so much for
giving me the OPPORTUNITY to help.
The Big Bang Theory Season 2, Episode 19

The OPPORTUNITY for Jon Snow
to cut my throat in my sleep.
Game of Thrones Season 2, Episode 10