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