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