I must patter you must patter she must patter we must patter you must patter they must patter
V-ing form
I must be pattering you must be pattering she must be pattering we must be pattering you must be pattering they must be pattering
Perfect
I must have pattered you must have pattered she 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 she must have been pattering we must have been pattering you must have been pattering they must have been pattering
Negation
Simple form
I mustn't patter you mustn't patter she mustn't patter we mustn't patter you mustn't patter they mustn't patter
V-ing form
I mustn't be pattering you mustn't be pattering she mustn't be pattering we mustn't be pattering you mustn't be pattering they mustn't be pattering
Perfect
I mustn't have pattered you mustn't have pattered she mustn't have pattered we mustn't have pattered you mustn't have pattered they mustn't have pattered
V-ing perfect
I mustn't have been pattering you mustn't have been pattering she mustn't have been pattering we mustn't have been pattering you mustn't have been pattering they mustn't have been pattering
Interrogative form
Simple form
must I patter? must you patter? must she patter? must we patter? must you patter? must they patter?
V-ing form
must I be pattering? must you be pattering? must she be pattering? must we be pattering? must you be pattering? must they be pattering?
Perfect
must I have pattered? must you have pattered? must she 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 she have been pattering? must we have been pattering? must you have been pattering? must they have been pattering?
Interro-negative form
Simple form
mustn't I patter? mustn't you patter? mustn't she patter? mustn't we patter? mustn't you patter? mustn't they patter?
V-ing form
mustn't I be pattering? mustn't you be pattering? mustn't she be pattering? mustn't we be pattering? mustn't you be pattering? mustn't they be pattering?
Perfect
mustn't I have pattered? mustn't you have pattered? mustn't she have pattered? mustn't we have pattered? mustn't you have pattered? mustn't they have pattered?
V-ing perfect
mustn't I have been pattering? mustn't you have been pattering? mustn't she have been pattering? mustn't we have been pattering? mustn't you have been pattering? mustn't they have been pattering?