I could atrophy you could atrophy she could atrophy we could atrophy you could atrophy they could atrophy
V-ing form
I could be atrophying you could be atrophying she could be atrophying we could be atrophying you could be atrophying they could be atrophying
Perfect
I could have atrophied you could have atrophied she 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 she 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 she 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 she 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 she 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 she 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 she atrophy? could we atrophy? could you atrophy? could they atrophy?
V-ing form
could I be atrophying? could you be atrophying? could she be atrophying? could we be atrophying? could you be atrophying? could they be atrophying?
Perfect
could I have atrophied? could you have atrophied? could she 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 she 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 she 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 she 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 she 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 she have been atrophying? couldn't we have been atrophying? couldn't you have been atrophying? couldn't they have been atrophying?