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