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