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