English verb conjugation
COULD ENDEAVOR

Regular verb: endeavor - endeavored - endeavored

Affirmation

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

Negation

Simple form	V-ing form
I could not endeavor you could not endeavor he could not endeavor we could not endeavor you could not endeavor they could not endeavor	I could not be endeavoring you could not be endeavoring he could not be endeavoring we could not be endeavoring you could not be endeavoring they could not be endeavoring
Perfect	V-ing perfect
I could not have endeavored you could not have endeavored he could not have endeavored we could not have endeavored you could not have endeavored they could not have endeavored	I could not have been endeavoring you could not have been endeavoring he could not have been endeavoring we could not have been endeavoring you could not have been endeavoring they could not have been endeavoring

Interrogative form

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

Interro-negative form

Simple form	V-ing form
could I not endeavor? could you not endeavor? could he not endeavor? could we not endeavor? could you not endeavor? could they not endeavor?	could I not be endeavoring? could you not be endeavoring? could he not be endeavoring? could we not be endeavoring? could you not be endeavoring? could they not be endeavoring?
Perfect	V-ing perfect
could I not have endeavored? could you not have endeavored? could he not have endeavored? could we not have endeavored? could you not have endeavored? could they not have endeavored?	could I not have been endeavoring? could you not have been endeavoring? could he not have been endeavoring? could we not have been endeavoring? could you not have been endeavoring? could they not have been endeavoring?