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