I must brood you must brood he must brood we must brood you must brood they must brood
V-ing form
I must be brooding you must be brooding he must be brooding we must be brooding you must be brooding they must be brooding
Perfect
I must have brooded you must have brooded he must have brooded we must have brooded you must have brooded they must have brooded
V-ing perfect
I must have been brooding you must have been brooding he must have been brooding we must have been brooding you must have been brooding they must have been brooding
Negation
Simple form
I must not brood you must not brood he must not brood we must not brood you must not brood they must not brood
V-ing form
I must not be brooding you must not be brooding he must not be brooding we must not be brooding you must not be brooding they must not be brooding
Perfect
I must not have brooded you must not have brooded he must not have brooded we must not have brooded you must not have brooded they must not have brooded
V-ing perfect
I must not have been brooding you must not have been brooding he must not have been brooding we must not have been brooding you must not have been brooding they must not have been brooding
Interrogative form
Simple form
must I brood? must you brood? must he brood? must we brood? must you brood? must they brood?
V-ing form
must I be brooding? must you be brooding? must he be brooding? must we be brooding? must you be brooding? must they be brooding?
Perfect
must I have brooded? must you have brooded? must he have brooded? must we have brooded? must you have brooded? must they have brooded?
V-ing perfect
must I have been brooding? must you have been brooding? must he have been brooding? must we have been brooding? must you have been brooding? must they have been brooding?
Interro-negative form
Simple form
must I not brood? must you not brood? must he not brood? must we not brood? must you not brood? must they not brood?
V-ing form
must I not be brooding? must you not be brooding? must he not be brooding? must we not be brooding? must you not be brooding? must they not be brooding?
Perfect
must I not have brooded? must you not have brooded? must he not have brooded? must we not have brooded? must you not have brooded? must they not have brooded?
V-ing perfect
must I not have been brooding? must you not have been brooding? must he not have been brooding? must we not have been brooding? must you not have been brooding? must they not have been brooding?