I could benefice you could benefice she could benefice we could benefice you could benefice they could benefice
V-ing form
I could be beneficing you could be beneficing she could be beneficing we could be beneficing you could be beneficing they could be beneficing
Perfect
I could have beneficed you could have beneficed she could have beneficed we could have beneficed you could have beneficed they could have beneficed
V-ing perfect
I could have been beneficing you could have been beneficing she could have been beneficing we could have been beneficing you could have been beneficing they could have been beneficing
Negation
Simple form
I couldn't benefice you couldn't benefice she couldn't benefice we couldn't benefice you couldn't benefice they couldn't benefice
V-ing form
I couldn't be beneficing you couldn't be beneficing she couldn't be beneficing we couldn't be beneficing you couldn't be beneficing they couldn't be beneficing
Perfect
I couldn't have beneficed you couldn't have beneficed she couldn't have beneficed we couldn't have beneficed you couldn't have beneficed they couldn't have beneficed
V-ing perfect
I couldn't have been beneficing you couldn't have been beneficing she couldn't have been beneficing we couldn't have been beneficing you couldn't have been beneficing they couldn't have been beneficing
Interrogative form
Simple form
could I benefice? could you benefice? could she benefice? could we benefice? could you benefice? could they benefice?
V-ing form
could I be beneficing? could you be beneficing? could she be beneficing? could we be beneficing? could you be beneficing? could they be beneficing?
Perfect
could I have beneficed? could you have beneficed? could she have beneficed? could we have beneficed? could you have beneficed? could they have beneficed?
V-ing perfect
could I have been beneficing? could you have been beneficing? could she have been beneficing? could we have been beneficing? could you have been beneficing? could they have been beneficing?
Interro-negative form
Simple form
couldn't I benefice? couldn't you benefice? couldn't she benefice? couldn't we benefice? couldn't you benefice? couldn't they benefice?
V-ing form
couldn't I be beneficing? couldn't you be beneficing? couldn't she be beneficing? couldn't we be beneficing? couldn't you be beneficing? couldn't they be beneficing?
Perfect
couldn't I have beneficed? couldn't you have beneficed? couldn't she have beneficed? couldn't we have beneficed? couldn't you have beneficed? couldn't they have beneficed?
V-ing perfect
couldn't I have been beneficing? couldn't you have been beneficing? couldn't she have been beneficing? couldn't we have been beneficing? couldn't you have been beneficing? couldn't they have been beneficing?