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 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
Perfect	V-ing perfect
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

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
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?
Perfect	V-ing perfect
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?