could author
Verbo regular: author - authored- authored

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could author
you could author
he could author
we could author
you could author
they could author 	I could be authoring
you could be authoring
he could be authoring
we could be authoring
you could be authoring
they could be authoring	I could have authored
you could have authored
he could have authored
we could have authored
you could have authored
they could have authored	I could have been authoring
you could have been authoring
he could have been authoring
we could have been authoring
you could have been authoring
they could have been authoring	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not author
you could not author
he could not author
we could not author
you could not author
they could not author 	I could not be authoring
you could not be authoring
he could not be authoring
we could not be authoring
you could not be authoring
they could not be authoring	I could not have authored
you could not have authored
he could not have authored
we could not have authored
you could not have authored
they could not have authored	I could not have been authoring
you could not have been authoring
he could not have been authoring
we could not have been authoring
you could not have been authoring
they could not have been authoring	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I author?
could you author?
could he author?
could we author?
could you author?
could they author? 	could I be authoring?
could you be authoring?
could he be authoring?
could we be authoring?
could you be authoring?
could they be authoring? 	could I have authored?
could you have authored?
could he have authored?
could we have authored?
could you have authored?
could they have authored? 	could I have been authoring?
could you have been authoring?
could he have been authoring?
could we have been authoring?
could you have been authoring?
could they have been authoring? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not author?
could you not author?
could he not author?
could we not author?
could you not author?
could they not author? 	could I not be authoring?
could you not be authoring?
could he not be authoring?
could we not be authoring?
could you not be authoring?
could they not be authoring? 	could I not have authored?
could you not have authored?
could he not have authored?
could we not have authored?
could you not have authored?
could they not have authored? 	could I not have been authoring?
could you not have been authoring?
could he not have been authoring?
could we not have been authoring?
could you not have been authoring?
could they not have been authoring?