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.

- How was your flight?
- Very PLEASANT. And yours?
The Big Bang Theory Season 8, Episode 23

...I don't know, PLEASANT?
The Big Bang Theory Season 2, Episode 13

Well, this is very PLEASANT.
The Big Bang Theory Season 2, Episode 9

Okay. Well, it was PLEASANT seeing you.
The Big Bang Theory Season 1, Episode 15

Hello, Sheldon, what a PLEASANT surprise.
How are you?
The Big Bang Theory Season 10, Episode 18