could disvalue
Regular verb: disvalue - disvalued- disvalued

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could disvalue
you could disvalue
she could disvalue
we could disvalue
you could disvalue
they could disvalue 	I could be disvaluing
you could be disvaluing
she could be disvaluing
we could be disvaluing
you could be disvaluing
they could be disvaluing	I could have disvalued
you could have disvalued
she could have disvalued
we could have disvalued
you could have disvalued
they could have disvalued	I could have been disvaluing
you could have been disvaluing
she could have been disvaluing
we could have been disvaluing
you could have been disvaluing
they could have been disvaluing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't disvalue
you couldn't disvalue
she couldn't disvalue
we couldn't disvalue
you couldn't disvalue
they couldn't disvalue 	I couldn't be disvaluing
you couldn't be disvaluing
she couldn't be disvaluing
we couldn't be disvaluing
you couldn't be disvaluing
they couldn't be disvaluing	I couldn't have disvalued
you couldn't have disvalued
she couldn't have disvalued
we couldn't have disvalued
you couldn't have disvalued
they couldn't have disvalued	I couldn't have been disvaluing
you couldn't have been disvaluing
she couldn't have been disvaluing
we couldn't have been disvaluing
you couldn't have been disvaluing
they couldn't have been disvaluing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I disvalue?
could you disvalue?
could she disvalue?
could we disvalue?
could you disvalue?
could they disvalue? 	could I be disvaluing?
could you be disvaluing?
could she be disvaluing?
could we be disvaluing?
could you be disvaluing?
could they be disvaluing? 	could I have disvalued?
could you have disvalued?
could she have disvalued?
could we have disvalued?
could you have disvalued?
could they have disvalued? 	could I have been disvaluing?
could you have been disvaluing?
could she have been disvaluing?
could we have been disvaluing?
could you have been disvaluing?
could they have been disvaluing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I disvalue?
couldn't you disvalue?
couldn't she disvalue?
couldn't we disvalue?
couldn't you disvalue?
couldn't they disvalue? 	couldn't I be disvaluing?
couldn't you be disvaluing?
couldn't she be disvaluing?
couldn't we be disvaluing?
couldn't you be disvaluing?
couldn't they be disvaluing? 	couldn't I have disvalued?
couldn't you have disvalued?
couldn't she have disvalued?
couldn't we have disvalued?
couldn't you have disvalued?
couldn't they have disvalued? 	couldn't I have been disvaluing?
couldn't you have been disvaluing?
couldn't she have been disvaluing?
couldn't we have been disvaluing?
couldn't you have been disvaluing?
couldn't they have been disvaluing?