It happened quite some time ago.
They were supposed to be here an hour ago.
The population has increased from 1.2 million 10 years ago to 1.8 million now.
All that happened many moons ago.
There were lots of buffaloes in the North America 100 years ago.
Long ago enormous animals lived on the earth.
He joined the army a year ago.
He came here two years ago.
We toured France about three years ago.