English verb conjugation
COULD DECIPHER

Regular verb: decipher - deciphered - deciphered

Affirmation

Simple form	V-ing form
I could decipher you could decipher he could decipher we could decipher you could decipher they could decipher	I could be deciphering you could be deciphering he could be deciphering we could be deciphering you could be deciphering they could be deciphering
Perfect	V-ing perfect
I could have deciphered you could have deciphered he could have deciphered we could have deciphered you could have deciphered they could have deciphered	I could have been deciphering you could have been deciphering he could have been deciphering we could have been deciphering you could have been deciphering they could have been deciphering

Negation

Simple form	V-ing form
I could not decipher you could not decipher he could not decipher we could not decipher you could not decipher they could not decipher	I could not be deciphering you could not be deciphering he could not be deciphering we could not be deciphering you could not be deciphering they could not be deciphering
Perfect	V-ing perfect
I could not have deciphered you could not have deciphered he could not have deciphered we could not have deciphered you could not have deciphered they could not have deciphered	I could not have been deciphering you could not have been deciphering he could not have been deciphering we could not have been deciphering you could not have been deciphering they could not have been deciphering

Interrogative form

Simple form	V-ing form
could I decipher? could you decipher? could he decipher? could we decipher? could you decipher? could they decipher?	could I be deciphering? could you be deciphering? could he be deciphering? could we be deciphering? could you be deciphering? could they be deciphering?
Perfect	V-ing perfect
could I have deciphered? could you have deciphered? could he have deciphered? could we have deciphered? could you have deciphered? could they have deciphered?	could I have been deciphering? could you have been deciphering? could he have been deciphering? could we have been deciphering? could you have been deciphering? could they have been deciphering?

Interro-negative form

Simple form	V-ing form
could I not decipher? could you not decipher? could he not decipher? could we not decipher? could you not decipher? could they not decipher?	could I not be deciphering? could you not be deciphering? could he not be deciphering? could we not be deciphering? could you not be deciphering? could they not be deciphering?
Perfect	V-ing perfect
could I not have deciphered? could you not have deciphered? could he not have deciphered? could we not have deciphered? could you not have deciphered? could they not have deciphered?	could I not have been deciphering? could you not have been deciphering? could he not have been deciphering? could we not have been deciphering? could you not have been deciphering? could they not have been deciphering?