Okay, the NASA website says
Howard's final descent has BEGUN.
The Big Bang Theory Season 6, Episode 4
The war's already BEGUN,
I've drawn first blood.
Game of Thrones Season 7, Episode 3
But you've already BEGUN.
Game of Thrones Season 2, Episode 6
Then the robot uprising has BEGUN.
The Big Bang Theory Season 10, Episode 9
The reaction has BEGUN.
Breaking Bad Season 5, Episode 14