I could benefice you could benefice he could benefice we could benefice you could benefice they could benefice
V-ing form
I could be beneficing you could be beneficing he could be beneficing we could be beneficing you could be beneficing they could be beneficing
Perfect
I could have beneficed you could have beneficed he 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 he 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 he 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 he 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 he 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 he 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 he benefice? could we benefice? could you benefice? could they benefice?
V-ing form
could I be beneficing? could you be beneficing? could he be beneficing? could we be beneficing? could you be beneficing? could they be beneficing?
Perfect
could I have beneficed? could you have beneficed? could he 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 he 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 he 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 he 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 he 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 he have been beneficing? couldn't we have been beneficing? couldn't you have been beneficing? couldn't they have been beneficing?