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