That already started.
It has begun.
It's begun.
They started dating.
That has already started.
Everything has a beginning.
There has to be a first time for everything.
I started that finally.
They wondered what to do first.
いや,始まったばかりだ。
Let's begin at the beginning.
It has begun.
It's begun.
I thought so all along.
We could accomplish what we had started before.
そらまた始まった