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 could not atrophy you could not atrophy she could not atrophy we could not atrophy you could not atrophy they could not atrophy
V-ing form
I could not be atrophying you could not be atrophying she could not be atrophying we could not be atrophying you could not be atrophying they could not be atrophying
Perfect
I could not have atrophied you could not have atrophied she could not have atrophied we could not have atrophied you could not have atrophied they could not have atrophied
V-ing perfect
I could not have been atrophying you could not have been atrophying she could not have been atrophying we could not have been atrophying you could not have been atrophying they could not 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
could I not atrophy? could you not atrophy? could she not atrophy? could we not atrophy? could you not atrophy? could they not atrophy?
V-ing form
could I not be atrophying? could you not be atrophying? could she not be atrophying? could we not be atrophying? could you not be atrophying? could they not be atrophying?
Perfect
could I not have atrophied? could you not have atrophied? could she not have atrophied? could we not have atrophied? could you not have atrophied? could they not have atrophied?
V-ing perfect
could I not have been atrophying? could you not have been atrophying? could she not have been atrophying? could we not have been atrophying? could you not have been atrophying? could they not have been atrophying?