I could vault you could vault he could vault we could vault you could vault they could vault
V-ing form
I could be vaulting you could be vaulting he could be vaulting we could be vaulting you could be vaulting they could be vaulting
Perfect
I could have vaulted you could have vaulted he could have vaulted we could have vaulted you could have vaulted they could have vaulted
V-ing perfect
I could have been vaulting you could have been vaulting he could have been vaulting we could have been vaulting you could have been vaulting they could have been vaulting
Negation
Simple form
I could not vault you could not vault he could not vault we could not vault you could not vault they could not vault
V-ing form
I could not be vaulting you could not be vaulting he could not be vaulting we could not be vaulting you could not be vaulting they could not be vaulting
Perfect
I could not have vaulted you could not have vaulted he could not have vaulted we could not have vaulted you could not have vaulted they could not have vaulted
V-ing perfect
I could not have been vaulting you could not have been vaulting he could not have been vaulting we could not have been vaulting you could not have been vaulting they could not have been vaulting
Interrogative form
Simple form
could I vault? could you vault? could he vault? could we vault? could you vault? could they vault?
V-ing form
could I be vaulting? could you be vaulting? could he be vaulting? could we be vaulting? could you be vaulting? could they be vaulting?
Perfect
could I have vaulted? could you have vaulted? could he have vaulted? could we have vaulted? could you have vaulted? could they have vaulted?
V-ing perfect
could I have been vaulting? could you have been vaulting? could he have been vaulting? could we have been vaulting? could you have been vaulting? could they have been vaulting?
Interro-negative form
Simple form
could I not vault? could you not vault? could he not vault? could we not vault? could you not vault? could they not vault?
V-ing form
could I not be vaulting? could you not be vaulting? could he not be vaulting? could we not be vaulting? could you not be vaulting? could they not be vaulting?
Perfect
could I not have vaulted? could you not have vaulted? could he not have vaulted? could we not have vaulted? could you not have vaulted? could they not have vaulted?
V-ing perfect
could I not have been vaulting? could you not have been vaulting? could he not have been vaulting? could we not have been vaulting? could you not have been vaulting? could they not have been vaulting?