Never before or since have I seen a human being run so fast.
She thought she'd never run so fast in her life before.
They had never run so fast in their lives before!
But this year, she has been running fast every race.
He ran very fast away from the house, down toward the river.
He had run that fast seven times, but not since 1993.
Mark had not known that his mother could still run so fast.
He had one thing to hold on to: his ability to run fast.
He was too heavy to run fast for very long.
A man might be able to run faster, but not by very much.