must author
Verbo regular: author - authored- authored

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

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

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

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