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.

led by the ELDEST female
in the herd.
Breaking Bad Season 2, Episode 12

And now I'm marrying my ELDEST son
to a wicked little bitch from Highgarden,
Game of Thrones Season 4, Episode 1

And now you want to send my ELDEST son
to the battlefield to die.
Game of Thrones Season 2, Episode 8

Your sister took over command
of your ELDEST brother's ship
Game of Thrones Season 2, Episode 2

ELDEST daughter of Lord Eddard Stark.
Game of Thrones Season 4, Episode 8