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