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