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