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