I can decipher you can decipher he can decipher we can decipher you can decipher they can decipher
V-ing form
I can be deciphering you can be deciphering he can be deciphering we can be deciphering you can be deciphering they can be deciphering
Perfect
I can have deciphered you can have deciphered he can have deciphered we can have deciphered you can have deciphered they can have deciphered
V-ing perfect
I can have been deciphering you can have been deciphering he can have been deciphering we can have been deciphering you can have been deciphering they can have been deciphering
Negation
Simple form
I cannot decipher you cannot decipher he cannot decipher we cannot decipher you cannot decipher they cannot decipher
V-ing form
I cannot be deciphering you cannot be deciphering he cannot be deciphering we cannot be deciphering you cannot be deciphering they cannot be deciphering
Perfect
I cannot have deciphered you cannot have deciphered he cannot have deciphered we cannot have deciphered you cannot have deciphered they cannot have deciphered
V-ing perfect
I cannot have been deciphering you cannot have been deciphering he cannot have been deciphering we cannot have been deciphering you cannot have been deciphering they cannot have been deciphering
Interrogative form
Simple form
can I decipher? can you decipher? can he decipher? can we decipher? can you decipher? can they decipher?
V-ing form
can I be deciphering? can you be deciphering? can he be deciphering? can we be deciphering? can you be deciphering? can they be deciphering?
Perfect
can I have deciphered? can you have deciphered? can he have deciphered? can we have deciphered? can you have deciphered? can they have deciphered?
V-ing perfect
can I have been deciphering? can you have been deciphering? can he have been deciphering? can we have been deciphering? can you have been deciphering? can they have been deciphering?
Interro-negative form
Simple form
can I not decipher? can you not decipher? can he not decipher? can we not decipher? can you not decipher? can they not decipher?
V-ing form
can I not be deciphering? can you not be deciphering? can he not be deciphering? can we not be deciphering? can you not be deciphering? can they not be deciphering?
Perfect
can I not have deciphered? can you not have deciphered? can he not have deciphered? can we not have deciphered? can you not have deciphered? can they not have deciphered?
V-ing perfect
can I not have been deciphering? can you not have been deciphering? can he not have been deciphering? can we not have been deciphering? can you not have been deciphering? can they not have been deciphering?