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.

I was SAVING it for the day they
stop making Star Wars movies.
The Big Bang Theory Season 12, Episode 10

I'm SAVING those for us.
The Big Bang Theory Season 11, Episode 16

So why is he SAVING them?
Game of Thrones Season 5, Episode 8

I'm Master of Coin.
Saving money is important.
Game of Thrones Season 3, Episode 5

I'm SAVING you from
the huge international ridicule
Money Heist Season 3, Episode 6