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