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