I must flute you must flute he must flute we must flute you must flute they must flute
V-ing form
I must be fluting you must be fluting he must be fluting we must be fluting you must be fluting they must be fluting
Perfect
I must have fluted you must have fluted he 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 he must have been fluting we must have been fluting you must have been fluting they must have been fluting
Negation
Simple form
I must not flute you must not flute he must not flute we must not flute you must not flute they must not flute
V-ing form
I must not be fluting you must not be fluting he must not be fluting we must not be fluting you must not be fluting they must not be fluting
Perfect
I must not have fluted you must not have fluted he must not have fluted we must not have fluted you must not have fluted they must not have fluted
V-ing perfect
I must not have been fluting you must not have been fluting he must not have been fluting we must not have been fluting you must not have been fluting they must not have been fluting
Interrogative form
Simple form
must I flute? must you flute? must he flute? must we flute? must you flute? must they flute?
V-ing form
must I be fluting? must you be fluting? must he be fluting? must we be fluting? must you be fluting? must they be fluting?
Perfect
must I have fluted? must you have fluted? must he 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 he have been fluting? must we have been fluting? must you have been fluting? must they have been fluting?
Interro-negative form
Simple form
must I not flute? must you not flute? must he not flute? must we not flute? must you not flute? must they not flute?
V-ing form
must I not be fluting? must you not be fluting? must he not be fluting? must we not be fluting? must you not be fluting? must they not be fluting?
Perfect
must I not have fluted? must you not have fluted? must he not have fluted? must we not have fluted? must you not have fluted? must they not have fluted?
V-ing perfect
must I not have been fluting? must you not have been fluting? must he not have been fluting? must we not have been fluting? must you not have been fluting? must they not have been fluting?