First…

Before going…

In the beginning…

Earlier...

Once upon a time...

Long ago...

In the winter… (or spring, summer or fall)

Next...

Then...

Years ago…

Before you were born…

A few  hours later…

Soon after…

Between…

While I was at the doctor’s office…

After that…

Afterward…

After school…

Later that afternoon…

Eventually…

When…

Next Saturday (any day of week)…

Instantly…

At the end of the trip, day, week

In Conclusion...

Finally…