I must patter you must patter he must patter we must patter you must patter they must patter
V-ing form
I must be pattering you must be pattering he must be pattering we must be pattering you must be pattering they must be pattering
Perfect
I must have pattered you must have pattered he must have pattered we must have pattered you must have pattered they must have pattered
V-ing perfect
I must have been pattering you must have been pattering he must have been pattering we must have been pattering you must have been pattering they must have been pattering
Negation
Simple form
I must not patter you must not patter he must not patter we must not patter you must not patter they must not patter
V-ing form
I must not be pattering you must not be pattering he must not be pattering we must not be pattering you must not be pattering they must not be pattering
Perfect
I must not have pattered you must not have pattered he must not have pattered we must not have pattered you must not have pattered they must not have pattered
V-ing perfect
I must not have been pattering you must not have been pattering he must not have been pattering we must not have been pattering you must not have been pattering they must not have been pattering
Interrogative form
Simple form
must I patter? must you patter? must he patter? must we patter? must you patter? must they patter?
V-ing form
must I be pattering? must you be pattering? must he be pattering? must we be pattering? must you be pattering? must they be pattering?
Perfect
must I have pattered? must you have pattered? must he have pattered? must we have pattered? must you have pattered? must they have pattered?
V-ing perfect
must I have been pattering? must you have been pattering? must he have been pattering? must we have been pattering? must you have been pattering? must they have been pattering?
Interro-negative form
Simple form
must I not patter? must you not patter? must he not patter? must we not patter? must you not patter? must they not patter?
V-ing form
must I not be pattering? must you not be pattering? must he not be pattering? must we not be pattering? must you not be pattering? must they not be pattering?
Perfect
must I not have pattered? must you not have pattered? must he not have pattered? must we not have pattered? must you not have pattered? must they not have pattered?
V-ing perfect
must I not have been pattering? must you not have been pattering? must he not have been pattering? must we not have been pattering? must you not have been pattering? must they not have been pattering?