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.

Initiate landing SEQUENCE!
Initiate landing SEQUENCE!
The Big Bang Theory Season 8, Episode 22

Initiating calibration SEQUENCE.
The Big Bang Theory Season 8, Episode 22

-There’s a SEQUENCE of numbers.
-But I can’t do that.
Money Heist Season 1, Episode 10

Initiate landing SEQUENCE!
Initiate landing SEQUENCE!
The Big Bang Theory Season 8, Episode 22

Initiating rotation SEQUENCE.
The Big Bang Theory Season 8, Episode 22