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.

...is this SUBWAY, the transportation system,
or Subway, the sandwich shop?
The Big Bang Theory Season 1, Episode 17

...is this SUBWAY, the transportation system,
or Subway, the sandwich shop?
The Big Bang Theory Season 1, Episode 17