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