Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could tell tell you could tell tell he could tell tell we could tell tell you could tell tell they could tell tell
V-ing form
I could be tell telling you could be tell telling he could be tell telling we could be tell telling you could be tell telling they could be tell telling
Perfect
I could have tell telled you could have tell telled he could have tell telled we could have tell telled you could have tell telled they could have tell telled
V-ing perfect
I could have been tell telling you could have been tell telling he could have been tell telling we could have been tell telling you could have been tell telling they could have been tell telling
Negation
Simple form
I could not tell tell you could not tell tell he could not tell tell we could not tell tell you could not tell tell they could not tell tell
V-ing form
I could not be tell telling you could not be tell telling he could not be tell telling we could not be tell telling you could not be tell telling they could not be tell telling
Perfect
I could not have tell telled you could not have tell telled he could not have tell telled we could not have tell telled you could not have tell telled they could not have tell telled
V-ing perfect
I could not have been tell telling you could not have been tell telling he could not have been tell telling we could not have been tell telling you could not have been tell telling they could not have been tell telling
Interrogative form
Simple form
could I tell tell? could you tell tell? could he tell tell? could we tell tell? could you tell tell? could they tell tell?
V-ing form
could I be tell telling? could you be tell telling? could he be tell telling? could we be tell telling? could you be tell telling? could they be tell telling?
Perfect
could I have tell telled? could you have tell telled? could he have tell telled? could we have tell telled? could you have tell telled? could they have tell telled?
V-ing perfect
could I have been tell telling? could you have been tell telling? could he have been tell telling? could we have been tell telling? could you have been tell telling? could they have been tell telling?
Interro-negative form
Simple form
could I not tell tell? could you not tell tell? could he not tell tell? could we not tell tell? could you not tell tell? could they not tell tell?
V-ing form
could I not be tell telling? could you not be tell telling? could he not be tell telling? could we not be tell telling? could you not be tell telling? could they not be tell telling?
Perfect
could I not have tell telled? could you not have tell telled? could he not have tell telled? could we not have tell telled? could you not have tell telled? could they not have tell telled?
V-ing perfect
could I not have been tell telling? could you not have been tell telling? could he not have been tell telling? could we not have been tell telling? could you not have been tell telling? could they not have been tell telling?