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 couldn't tell tell you couldn't tell tell he couldn't tell tell we couldn't tell tell you couldn't tell tell they couldn't tell tell
V-ing form
I couldn't be tell telling you couldn't be tell telling he couldn't be tell telling we couldn't be tell telling you couldn't be tell telling they couldn't be tell telling
Perfect
I couldn't have tell telled you couldn't have tell telled he couldn't have tell telled we couldn't have tell telled you couldn't have tell telled they couldn't have tell telled
V-ing perfect
I couldn't have been tell telling you couldn't have been tell telling he couldn't have been tell telling we couldn't have been tell telling you couldn't have been tell telling they couldn't 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
couldn't I tell tell? couldn't you tell tell? couldn't he tell tell? couldn't we tell tell? couldn't you tell tell? couldn't they tell tell?
V-ing form
couldn't I be tell telling? couldn't you be tell telling? couldn't he be tell telling? couldn't we be tell telling? couldn't you be tell telling? couldn't they be tell telling?
Perfect
couldn't I have tell telled? couldn't you have tell telled? couldn't he have tell telled? couldn't we have tell telled? couldn't you have tell telled? couldn't they have tell telled?
V-ing perfect
couldn't I have been tell telling? couldn't you have been tell telling? couldn't he have been tell telling? couldn't we have been tell telling? couldn't you have been tell telling? couldn't they have been tell telling?