could vault
Regular verb: vault - vaulted- vaulted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vault
you could vault
she could vault
we could vault
you could vault
they could vault 	I could be vaulting
you could be vaulting
she could be vaulting
we could be vaulting
you could be vaulting
they could be vaulting	I could have vaulted
you could have vaulted
she 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
she 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 couldn't vault
you couldn't vault
she couldn't vault
we couldn't vault
you couldn't vault
they couldn't vault 	I couldn't be vaulting
you couldn't be vaulting
she couldn't be vaulting
we couldn't be vaulting
you couldn't be vaulting
they couldn't be vaulting	I couldn't have vaulted
you couldn't have vaulted
she couldn't have vaulted
we couldn't have vaulted
you couldn't have vaulted
they couldn't have vaulted	I couldn't have been vaulting
you couldn't have been vaulting
she couldn't have been vaulting
we couldn't have been vaulting
you couldn't have been vaulting
they couldn't have been vaulting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vault?
could you vault?
could she vault?
could we vault?
could you vault?
could they vault? 	could I be vaulting?
could you be vaulting?
could she be vaulting?
could we be vaulting?
could you be vaulting?
could they be vaulting? 	could I have vaulted?
could you have vaulted?
could she 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 she 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 	
couldn't I vault?
couldn't you vault?
couldn't she vault?
couldn't we vault?
couldn't you vault?
couldn't they vault? 	couldn't I be vaulting?
couldn't you be vaulting?
couldn't she be vaulting?
couldn't we be vaulting?
couldn't you be vaulting?
couldn't they be vaulting? 	couldn't I have vaulted?
couldn't you have vaulted?
couldn't she have vaulted?
couldn't we have vaulted?
couldn't you have vaulted?
couldn't they have vaulted? 	couldn't I have been vaulting?
couldn't you have been vaulting?
couldn't she have been vaulting?
couldn't we have been vaulting?
couldn't you have been vaulting?
couldn't they have been vaulting?