English verb conjugation
COULD DISSERVE

Regular verb: disserve - disserved - disserved

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?