English verb conjugation
MUST AUTHOR

Regular verb: author - authored - authored

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I mustn't author you mustn't author he mustn't author we mustn't author you mustn't author they mustn't author	I mustn't be authoring you mustn't be authoring he mustn't be authoring we mustn't be authoring you mustn't be authoring they mustn't be authoring
Perfect	V-ing perfect
I mustn't have authored you mustn't have authored he mustn't have authored we mustn't have authored you mustn't have authored they mustn't have authored	I mustn't have been authoring you mustn't have been authoring he mustn't have been authoring we mustn't have been authoring you mustn't have been authoring they mustn't have been authoring

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
mustn't I author? mustn't you author? mustn't he author? mustn't we author? mustn't you author? mustn't they author?	mustn't I be authoring? mustn't you be authoring? mustn't he be authoring? mustn't we be authoring? mustn't you be authoring? mustn't they be authoring?
Perfect	V-ing perfect
mustn't I have authored? mustn't you have authored? mustn't he have authored? mustn't we have authored? mustn't you have authored? mustn't they have authored?	mustn't I have been authoring? mustn't you have been authoring? mustn't he have been authoring? mustn't we have been authoring? mustn't you have been authoring? mustn't they have been authoring?