Perhaps I have, and perhaps I haven't, he remarked dryly. 
Perhaps I have or have not, he remarked coldly.
I have indeed been there before, he said.
The biker is jumping.
People run down the street while people watch them run.
The kids were fast asleep in their beds.
Three women are in a car.
Two girls walking along a rocky shore.
A yellow lab drinks from a pond.