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