I could blacktop you could blacktop he could blacktop we could blacktop you could blacktop they could blacktop
V-ing form
I could be blacktoping you could be blacktoping he could be blacktoping we could be blacktoping you could be blacktoping they could be blacktoping
Perfect
I could have blacktoped you could have blacktoped he could have blacktoped we could have blacktoped you could have blacktoped they could have blacktoped
V-ing perfect
I could have been blacktoping you could have been blacktoping he could have been blacktoping we could have been blacktoping you could have been blacktoping they could have been blacktoping
Negation
Simple form
I could not blacktop you could not blacktop he could not blacktop we could not blacktop you could not blacktop they could not blacktop
V-ing form
I could not be blacktoping you could not be blacktoping he could not be blacktoping we could not be blacktoping you could not be blacktoping they could not be blacktoping
Perfect
I could not have blacktoped you could not have blacktoped he could not have blacktoped we could not have blacktoped you could not have blacktoped they could not have blacktoped
V-ing perfect
I could not have been blacktoping you could not have been blacktoping he could not have been blacktoping we could not have been blacktoping you could not have been blacktoping they could not have been blacktoping
Interrogative form
Simple form
could I blacktop? could you blacktop? could he blacktop? could we blacktop? could you blacktop? could they blacktop?
V-ing form
could I be blacktoping? could you be blacktoping? could he be blacktoping? could we be blacktoping? could you be blacktoping? could they be blacktoping?
Perfect
could I have blacktoped? could you have blacktoped? could he have blacktoped? could we have blacktoped? could you have blacktoped? could they have blacktoped?
V-ing perfect
could I have been blacktoping? could you have been blacktoping? could he have been blacktoping? could we have been blacktoping? could you have been blacktoping? could they have been blacktoping?
Interro-negative form
Simple form
could I not blacktop? could you not blacktop? could he not blacktop? could we not blacktop? could you not blacktop? could they not blacktop?
V-ing form
could I not be blacktoping? could you not be blacktoping? could he not be blacktoping? could we not be blacktoping? could you not be blacktoping? could they not be blacktoping?
Perfect
could I not have blacktoped? could you not have blacktoped? could he not have blacktoped? could we not have blacktoped? could you not have blacktoped? could they not have blacktoped?
V-ing perfect
could I not have been blacktoping? could you not have been blacktoping? could he not have been blacktoping? could we not have been blacktoping? could you not have been blacktoping? could they not have been blacktoping?