English verb conjugation
MUST ENDEAVOR

Regular verb: endeavor - endeavored - endeavored

Affirmation

Simple form	V-ing form
I must endeavor you must endeavor he must endeavor we must endeavor you must endeavor they must endeavor	I must be endeavoring you must be endeavoring he must be endeavoring we must be endeavoring you must be endeavoring they must be endeavoring
Perfect	V-ing perfect
I must have endeavored you must have endeavored he must have endeavored we must have endeavored you must have endeavored they must have endeavored	I must have been endeavoring you must have been endeavoring he must have been endeavoring we must have been endeavoring you must have been endeavoring they must have been endeavoring

Negation

Simple form	V-ing form
I mustn't endeavor you mustn't endeavor he mustn't endeavor we mustn't endeavor you mustn't endeavor they mustn't endeavor	I mustn't be endeavoring you mustn't be endeavoring he mustn't be endeavoring we mustn't be endeavoring you mustn't be endeavoring they mustn't be endeavoring
Perfect	V-ing perfect
I mustn't have endeavored you mustn't have endeavored he mustn't have endeavored we mustn't have endeavored you mustn't have endeavored they mustn't have endeavored	I mustn't have been endeavoring you mustn't have been endeavoring he mustn't have been endeavoring we mustn't have been endeavoring you mustn't have been endeavoring they mustn't have been endeavoring

Interrogative form

Simple form	V-ing form
must I endeavor? must you endeavor? must he endeavor? must we endeavor? must you endeavor? must they endeavor?	must I be endeavoring? must you be endeavoring? must he be endeavoring? must we be endeavoring? must you be endeavoring? must they be endeavoring?
Perfect	V-ing perfect
must I have endeavored? must you have endeavored? must he have endeavored? must we have endeavored? must you have endeavored? must they have endeavored?	must I have been endeavoring? must you have been endeavoring? must he have been endeavoring? must we have been endeavoring? must you have been endeavoring? must they have been endeavoring?

Interro-negative form

Simple form	V-ing form
mustn't I endeavor? mustn't you endeavor? mustn't he endeavor? mustn't we endeavor? mustn't you endeavor? mustn't they endeavor?	mustn't I be endeavoring? mustn't you be endeavoring? mustn't he be endeavoring? mustn't we be endeavoring? mustn't you be endeavoring? mustn't they be endeavoring?
Perfect	V-ing perfect
mustn't I have endeavored? mustn't you have endeavored? mustn't he have endeavored? mustn't we have endeavored? mustn't you have endeavored? mustn't they have endeavored?	mustn't I have been endeavoring? mustn't you have been endeavoring? mustn't he have been endeavoring? mustn't we have been endeavoring? mustn't you have been endeavoring? mustn't they have been endeavoring?