I could decrypt you could decrypt she could decrypt we could decrypt you could decrypt they could decrypt
V-ing form
I could be decrypting you could be decrypting she could be decrypting we could be decrypting you could be decrypting they could be decrypting
Perfect
I could have decrypted you could have decrypted she could have decrypted we could have decrypted you could have decrypted they could have decrypted
V-ing perfect
I could have been decrypting you could have been decrypting she could have been decrypting we could have been decrypting you could have been decrypting they could have been decrypting
Negation
Simple form
I could not decrypt you could not decrypt she could not decrypt we could not decrypt you could not decrypt they could not decrypt
V-ing form
I could not be decrypting you could not be decrypting she could not be decrypting we could not be decrypting you could not be decrypting they could not be decrypting
Perfect
I could not have decrypted you could not have decrypted she could not have decrypted we could not have decrypted you could not have decrypted they could not have decrypted
V-ing perfect
I could not have been decrypting you could not have been decrypting she could not have been decrypting we could not have been decrypting you could not have been decrypting they could not have been decrypting
Interrogative form
Simple form
could I decrypt? could you decrypt? could she decrypt? could we decrypt? could you decrypt? could they decrypt?
V-ing form
could I be decrypting? could you be decrypting? could she be decrypting? could we be decrypting? could you be decrypting? could they be decrypting?
Perfect
could I have decrypted? could you have decrypted? could she have decrypted? could we have decrypted? could you have decrypted? could they have decrypted?
V-ing perfect
could I have been decrypting? could you have been decrypting? could she have been decrypting? could we have been decrypting? could you have been decrypting? could they have been decrypting?
Interro-negative form
Simple form
could I not decrypt? could you not decrypt? could she not decrypt? could we not decrypt? could you not decrypt? could they not decrypt?
V-ing form
could I not be decrypting? could you not be decrypting? could she not be decrypting? could we not be decrypting? could you not be decrypting? could they not be decrypting?
Perfect
could I not have decrypted? could you not have decrypted? could she not have decrypted? could we not have decrypted? could you not have decrypted? could they not have decrypted?
V-ing perfect
could I not have been decrypting? could you not have been decrypting? could she not have been decrypting? could we not have been decrypting? could you not have been decrypting? could they not have been decrypting?