Then, in the summer of 1916, things began to happen.

When it actually began to happen no one said anything.

When we get into the current things are going to begin to happen.

Once they do, it will begin to happen more often.

You, more than anyone else, know what is beginning to happen.

They'll let us know if anything is beginning to happen?

In the summer of 1989 things began to happen fast.

When things began to happen to him a month ago.

A few years passed and then something began to happen.

These questions go back further than that, before the story events began to happen.