I must matter you must matter he must matter we must matter you must matter they must matter
V-ing form
I must be mattering you must be mattering he must be mattering we must be mattering you must be mattering they must be mattering
Perfect
I must have mattered you must have mattered he must have mattered we must have mattered you must have mattered they must have mattered
V-ing perfect
I must have been mattering you must have been mattering he must have been mattering we must have been mattering you must have been mattering they must have been mattering
Negation
Simple form
I mustn't matter you mustn't matter he mustn't matter we mustn't matter you mustn't matter they mustn't matter
V-ing form
I mustn't be mattering you mustn't be mattering he mustn't be mattering we mustn't be mattering you mustn't be mattering they mustn't be mattering
Perfect
I mustn't have mattered you mustn't have mattered he mustn't have mattered we mustn't have mattered you mustn't have mattered they mustn't have mattered
V-ing perfect
I mustn't have been mattering you mustn't have been mattering he mustn't have been mattering we mustn't have been mattering you mustn't have been mattering they mustn't have been mattering
Interrogative form
Simple form
must I matter? must you matter? must he matter? must we matter? must you matter? must they matter?
V-ing form
must I be mattering? must you be mattering? must he be mattering? must we be mattering? must you be mattering? must they be mattering?
Perfect
must I have mattered? must you have mattered? must he have mattered? must we have mattered? must you have mattered? must they have mattered?
V-ing perfect
must I have been mattering? must you have been mattering? must he have been mattering? must we have been mattering? must you have been mattering? must they have been mattering?
Interro-negative form
Simple form
mustn't I matter? mustn't you matter? mustn't he matter? mustn't we matter? mustn't you matter? mustn't they matter?
V-ing form
mustn't I be mattering? mustn't you be mattering? mustn't he be mattering? mustn't we be mattering? mustn't you be mattering? mustn't they be mattering?
Perfect
mustn't I have mattered? mustn't you have mattered? mustn't he have mattered? mustn't we have mattered? mustn't you have mattered? mustn't they have mattered?
V-ing perfect
mustn't I have been mattering? mustn't you have been mattering? mustn't he have been mattering? mustn't we have been mattering? mustn't you have been mattering? mustn't they have been mattering?