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 can't decipher you can't decipher he can't decipher we can't decipher you can't decipher they can't decipher
V-ing form
I can't be deciphering you can't be deciphering he can't be deciphering we can't be deciphering you can't be deciphering they can't be deciphering
Perfect
I can't have deciphered you can't have deciphered he can't have deciphered we can't have deciphered you can't have deciphered they can't have deciphered
V-ing perfect
I can't have been deciphering you can't have been deciphering he can't have been deciphering we can't have been deciphering you can't have been deciphering they can't 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't I decipher? can't you decipher? can't he decipher? can't we decipher? can't you decipher? can't they decipher?
V-ing form
can't I be deciphering? can't you be deciphering? can't he be deciphering? can't we be deciphering? can't you be deciphering? can't they be deciphering?
Perfect
can't I have deciphered? can't you have deciphered? can't he have deciphered? can't we have deciphered? can't you have deciphered? can't they have deciphered?
V-ing perfect
can't I have been deciphering? can't you have been deciphering? can't he have been deciphering? can't we have been deciphering? can't you have been deciphering? can't they have been deciphering?