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