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.

It was customary for me
to EXTEND him an invitation.
Game of Thrones Season 2, Episode 5

I'd thank you to EXTEND me
the same courtesy.
The Big Bang Theory Season 4, Episode 22

your right to revoke, I
exercised my right to EXTEND,
The Big Bang Theory Season 11, Episode 14

to EXTEND to you
an invitation to--
Westworld Season 2, Episode 3

As a middle child myself,
I'd like to EXTEND
The Big Bang Theory Season 12, Episode 5