I could gallop you could gallop he could gallop we could gallop you could gallop they could gallop
V-ing form
I could be galloping you could be galloping he could be galloping we could be galloping you could be galloping they could be galloping
Perfect
I could have galloped you could have galloped he could have galloped we could have galloped you could have galloped they could have galloped
V-ing perfect
I could have been galloping you could have been galloping he could have been galloping we could have been galloping you could have been galloping they could have been galloping
Negation
Simple form
I couldn't gallop you couldn't gallop he couldn't gallop we couldn't gallop you couldn't gallop they couldn't gallop
V-ing form
I couldn't be galloping you couldn't be galloping he couldn't be galloping we couldn't be galloping you couldn't be galloping they couldn't be galloping
Perfect
I couldn't have galloped you couldn't have galloped he couldn't have galloped we couldn't have galloped you couldn't have galloped they couldn't have galloped
V-ing perfect
I couldn't have been galloping you couldn't have been galloping he couldn't have been galloping we couldn't have been galloping you couldn't have been galloping they couldn't have been galloping
Interrogative form
Simple form
could I gallop? could you gallop? could he gallop? could we gallop? could you gallop? could they gallop?
V-ing form
could I be galloping? could you be galloping? could he be galloping? could we be galloping? could you be galloping? could they be galloping?
Perfect
could I have galloped? could you have galloped? could he have galloped? could we have galloped? could you have galloped? could they have galloped?
V-ing perfect
could I have been galloping? could you have been galloping? could he have been galloping? could we have been galloping? could you have been galloping? could they have been galloping?
Interro-negative form
Simple form
couldn't I gallop? couldn't you gallop? couldn't he gallop? couldn't we gallop? couldn't you gallop? couldn't they gallop?
V-ing form
couldn't I be galloping? couldn't you be galloping? couldn't he be galloping? couldn't we be galloping? couldn't you be galloping? couldn't they be galloping?
Perfect
couldn't I have galloped? couldn't you have galloped? couldn't he have galloped? couldn't we have galloped? couldn't you have galloped? couldn't they have galloped?
V-ing perfect
couldn't I have been galloping? couldn't you have been galloping? couldn't he have been galloping? couldn't we have been galloping? couldn't you have been galloping? couldn't they have been galloping?