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.

They start with infatuation, but over time
mellow INTO something more comfortable.
The Big Bang Theory Season 10, Episode 13

- You put no thought INTO that.
- I'm sorry. Ah...
The Big Bang Theory Season 2, Episode 11

...and it is ridiculously easy
to break INTO her apartment.
The Big Bang Theory Season 6, Episode 2

So I'm glad I ran INTO you.
The Big Bang Theory Season 1, Episode 5

Go INTO your bedroom now,
grab anything important.
Breaking Bad Season 5, Episode 14