English verb conjugation
MUST LABOR

Regular verb: labor - labored - labored

Affirmation

Simple form	V-ing form
I must labor you must labor he must labor we must labor you must labor they must labor	I must be laboring you must be laboring he must be laboring we must be laboring you must be laboring they must be laboring
Perfect	V-ing perfect
I must have labored you must have labored he must have labored we must have labored you must have labored they must have labored	I must have been laboring you must have been laboring he must have been laboring we must have been laboring you must have been laboring they must have been laboring

Negation

Simple form	V-ing form
I mustn't labor you mustn't labor he mustn't labor we mustn't labor you mustn't labor they mustn't labor	I mustn't be laboring you mustn't be laboring he mustn't be laboring we mustn't be laboring you mustn't be laboring they mustn't be laboring
Perfect	V-ing perfect
I mustn't have labored you mustn't have labored he mustn't have labored we mustn't have labored you mustn't have labored they mustn't have labored	I mustn't have been laboring you mustn't have been laboring he mustn't have been laboring we mustn't have been laboring you mustn't have been laboring they mustn't have been laboring

Interrogative form

Simple form	V-ing form
must I labor? must you labor? must he labor? must we labor? must you labor? must they labor?	must I be laboring? must you be laboring? must he be laboring? must we be laboring? must you be laboring? must they be laboring?
Perfect	V-ing perfect
must I have labored? must you have labored? must he have labored? must we have labored? must you have labored? must they have labored?	must I have been laboring? must you have been laboring? must he have been laboring? must we have been laboring? must you have been laboring? must they have been laboring?

Interro-negative form

Simple form	V-ing form
mustn't I labor? mustn't you labor? mustn't he labor? mustn't we labor? mustn't you labor? mustn't they labor?	mustn't I be laboring? mustn't you be laboring? mustn't he be laboring? mustn't we be laboring? mustn't you be laboring? mustn't they be laboring?
Perfect	V-ing perfect
mustn't I have labored? mustn't you have labored? mustn't he have labored? mustn't we have labored? mustn't you have labored? mustn't they have labored?	mustn't I have been laboring? mustn't you have been laboring? mustn't he have been laboring? mustn't we have been laboring? mustn't you have been laboring? mustn't they have been laboring?