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.

...as OPPOSED to what you do,
which does not.
The Big Bang Theory Season 2, Episode 2

As OPPOSED to the leading
nonsteroidal anti-inflammatory,
The Big Bang Theory Season 12, Episode 17

There's four in the affirmative.
Those OPPOSED?
Breaking Bad Season 4, Episode 3

In the refrigerator, as OPPOSED to two
separate shelves and one communal shelf...
The Big Bang Theory Season 2, Episode 10

...is diametrically OPPOSED
to my own parenting strategies.
The Big Bang Theory Season 8, Episode 23