can author
Regular verb: author - authored- authored

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can author
you can author
she can author
we can author
you can author
they can author 	I can be authoring
you can be authoring
she can be authoring
we can be authoring
you can be authoring
they can be authoring	I can have authored
you can have authored
she can have authored
we can have authored
you can have authored
they can have authored	I can have been authoring
you can have been authoring
she can have been authoring
we can have been authoring
you can have been authoring
they can have been authoring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't author
you can't author
she can't author
we can't author
you can't author
they can't author 	I can't be authoring
you can't be authoring
she can't be authoring
we can't be authoring
you can't be authoring
they can't be authoring	I can't have authored
you can't have authored
she can't have authored
we can't have authored
you can't have authored
they can't have authored	I can't have been authoring
you can't have been authoring
she can't have been authoring
we can't have been authoring
you can't have been authoring
they can't have been authoring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I author?
can you author?
can she author?
can we author?
can you author?
can they author? 	can I be authoring?
can you be authoring?
can she be authoring?
can we be authoring?
can you be authoring?
can they be authoring? 	can I have authored?
can you have authored?
can she have authored?
can we have authored?
can you have authored?
can they have authored? 	can I have been authoring?
can you have been authoring?
can she have been authoring?
can we have been authoring?
can you have been authoring?
can they have been authoring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I author?
can't you author?
can't she author?
can't we author?
can't you author?
can't they author? 	can't I be authoring?
can't you be authoring?
can't she be authoring?
can't we be authoring?
can't you be authoring?
can't they be authoring? 	can't I have authored?
can't you have authored?
can't she have authored?
can't we have authored?
can't you have authored?
can't they have authored? 	can't I have been authoring?
can't you have been authoring?
can't she have been authoring?
can't we have been authoring?
can't you have been authoring?
can't they have been authoring?