By the year 2020, the population of this city will have doubled.
The population has doubled in the last five years.
She doubled over, clutching her side.
The number of employees doubled in ten years.
I doubled over with laughter.
Two pictures were doubled.
Thanks to the technological innovation, the maximum output of the factory has doubled.
The population of the world is increasing so rapidly that it will be doubled within forty years.
In the play she doubled the parts of a maid and shop girl.
His revenue doubled after retirement.
In the course of the past year, prices have doubled.