could doven
Regular verb: doven - dovened- dovened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could doven
you could doven
he could doven
we could doven
you could doven
they could doven 	I could be dovening
you could be dovening
he could be dovening
we could be dovening
you could be dovening
they could be dovening	I could have dovened
you could have dovened
he could have dovened
we could have dovened
you could have dovened
they could have dovened	I could have been dovening
you could have been dovening
he could have been dovening
we could have been dovening
you could have been dovening
they could have been dovening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't doven
you couldn't doven
he couldn't doven
we couldn't doven
you couldn't doven
they couldn't doven 	I couldn't be dovening
you couldn't be dovening
he couldn't be dovening
we couldn't be dovening
you couldn't be dovening
they couldn't be dovening	I couldn't have dovened
you couldn't have dovened
he couldn't have dovened
we couldn't have dovened
you couldn't have dovened
they couldn't have dovened	I couldn't have been dovening
you couldn't have been dovening
he couldn't have been dovening
we couldn't have been dovening
you couldn't have been dovening
they couldn't have been dovening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I doven?
could you doven?
could he doven?
could we doven?
could you doven?
could they doven? 	could I be dovening?
could you be dovening?
could he be dovening?
could we be dovening?
could you be dovening?
could they be dovening? 	could I have dovened?
could you have dovened?
could he have dovened?
could we have dovened?
could you have dovened?
could they have dovened? 	could I have been dovening?
could you have been dovening?
could he have been dovening?
could we have been dovening?
could you have been dovening?
could they have been dovening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I doven?
couldn't you doven?
couldn't he doven?
couldn't we doven?
couldn't you doven?
couldn't they doven? 	couldn't I be dovening?
couldn't you be dovening?
couldn't he be dovening?
couldn't we be dovening?
couldn't you be dovening?
couldn't they be dovening? 	couldn't I have dovened?
couldn't you have dovened?
couldn't he have dovened?
couldn't we have dovened?
couldn't you have dovened?
couldn't they have dovened? 	couldn't I have been dovening?
couldn't you have been dovening?
couldn't he have been dovening?
couldn't we have been dovening?
couldn't you have been dovening?
couldn't they have been dovening?