Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could confer confer you could confer confer she could confer confer we could confer confer you could confer confer they could confer confer
V-ing form
I could be confer confering you could be confer confering she could be confer confering we could be confer confering you could be confer confering they could be confer confering
Perfect
I could have confer confered you could have confer confered she could have confer confered we could have confer confered you could have confer confered they could have confer confered
V-ing perfect
I could have been confer confering you could have been confer confering she could have been confer confering we could have been confer confering you could have been confer confering they could have been confer confering
Negation
Simple form
I could not confer confer you could not confer confer she could not confer confer we could not confer confer you could not confer confer they could not confer confer
V-ing form
I could not be confer confering you could not be confer confering she could not be confer confering we could not be confer confering you could not be confer confering they could not be confer confering
Perfect
I could not have confer confered you could not have confer confered she could not have confer confered we could not have confer confered you could not have confer confered they could not have confer confered
V-ing perfect
I could not have been confer confering you could not have been confer confering she could not have been confer confering we could not have been confer confering you could not have been confer confering they could not have been confer confering
Interrogative form
Simple form
could I confer confer? could you confer confer? could she confer confer? could we confer confer? could you confer confer? could they confer confer?
V-ing form
could I be confer confering? could you be confer confering? could she be confer confering? could we be confer confering? could you be confer confering? could they be confer confering?
Perfect
could I have confer confered? could you have confer confered? could she have confer confered? could we have confer confered? could you have confer confered? could they have confer confered?
V-ing perfect
could I have been confer confering? could you have been confer confering? could she have been confer confering? could we have been confer confering? could you have been confer confering? could they have been confer confering?
Interro-negative form
Simple form
could I not confer confer? could you not confer confer? could she not confer confer? could we not confer confer? could you not confer confer? could they not confer confer?
V-ing form
could I not be confer confering? could you not be confer confering? could she not be confer confering? could we not be confer confering? could you not be confer confering? could they not be confer confering?
Perfect
could I not have confer confered? could you not have confer confered? could she not have confer confered? could we not have confer confered? could you not have confer confered? could they not have confer confered?
V-ing perfect
could I not have been confer confering? could you not have been confer confering? could she not have been confer confering? could we not have been confer confering? could you not have been confer confering? could they not have been confer confering?