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