could disserve
Regular verb: disserve - disserved- disserved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could disserve
you could disserve
he could disserve
we could disserve
you could disserve
they could disserve 	I could be disserving
you could be disserving
he could be disserving
we could be disserving
you could be disserving
they could be disserving	I could have disserved
you could have disserved
he could have disserved
we could have disserved
you could have disserved
they could have disserved	I could have been disserving
you could have been disserving
he could have been disserving
we could have been disserving
you could have been disserving
they could have been disserving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't disserve
you couldn't disserve
he couldn't disserve
we couldn't disserve
you couldn't disserve
they couldn't disserve 	I couldn't be disserving
you couldn't be disserving
he couldn't be disserving
we couldn't be disserving
you couldn't be disserving
they couldn't be disserving	I couldn't have disserved
you couldn't have disserved
he couldn't have disserved
we couldn't have disserved
you couldn't have disserved
they couldn't have disserved	I couldn't have been disserving
you couldn't have been disserving
he couldn't have been disserving
we couldn't have been disserving
you couldn't have been disserving
they couldn't have been disserving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I disserve?
could you disserve?
could he disserve?
could we disserve?
could you disserve?
could they disserve? 	could I be disserving?
could you be disserving?
could he be disserving?
could we be disserving?
could you be disserving?
could they be disserving? 	could I have disserved?
could you have disserved?
could he have disserved?
could we have disserved?
could you have disserved?
could they have disserved? 	could I have been disserving?
could you have been disserving?
could he have been disserving?
could we have been disserving?
could you have been disserving?
could they have been disserving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I disserve?
couldn't you disserve?
couldn't he disserve?
couldn't we disserve?
couldn't you disserve?
couldn't they disserve? 	couldn't I be disserving?
couldn't you be disserving?
couldn't he be disserving?
couldn't we be disserving?
couldn't you be disserving?
couldn't they be disserving? 	couldn't I have disserved?
couldn't you have disserved?
couldn't he have disserved?
couldn't we have disserved?
couldn't you have disserved?
couldn't they have disserved? 	couldn't I have been disserving?
couldn't you have been disserving?
couldn't he have been disserving?
couldn't we have been disserving?
couldn't you have been disserving?
couldn't they have been disserving?