could vault
Regular verb: vault - vaulted- vaulted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vault
you could vault
he could vault
we could vault
you could vault
they could vault 	I could be vaulting
you could be vaulting
he could be vaulting
we could be vaulting
you could be vaulting
they could be vaulting	I could have vaulted
you could have vaulted
he could have vaulted
we could have vaulted
you could have vaulted
they could have vaulted	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 	V-ing form 	Perfect 	V-ing perfect 	
I could not vault
you could not vault
he could not vault
we could not vault
you could not vault
they could not vault 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
could I vault?
could you vault?
could he vault?
could we vault?
could you vault?
could they vault? 	could I be vaulting?
could you be vaulting?
could he be vaulting?
could we be vaulting?
could you be vaulting?
could they be vaulting? 	could I have vaulted?
could you have vaulted?
could he have vaulted?
could we have vaulted?
could you have vaulted?
could they have vaulted? 	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 	V-ing form 	Perfect 	V-ing perfect 	
could I not vault?
could you not vault?
could he not vault?
could we not vault?
could you not vault?
could they not vault? 	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? 	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? 	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?