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.

we'll deliver our troops to their DOORSTEP
and take the city.
Game of Thrones Season 2, Episode 5

right on our DOORSTEP.
Game of Thrones Season 2, Episode 3

I delivered an army of fanatics
onto our DOORSTEP.
Game of Thrones Season 6, Episode 7

and she left this
on my DOORSTEP with a note.
The Big Bang Theory Season 9, Episode 18

on a church DOORSTEP.
The Big Bang Theory Season 5, Episode 6