English verb conjugation
COULD GREATEN

Regular verb: greaten - greatened - greatened

Affirmation

Simple form	V-ing form
I could greaten you could greaten she could greaten we could greaten you could greaten they could greaten	I could be greatening you could be greatening she could be greatening we could be greatening you could be greatening they could be greatening
Perfect	V-ing perfect
I could have greatened you could have greatened she could have greatened we could have greatened you could have greatened they could have greatened	I could have been greatening you could have been greatening she could have been greatening we could have been greatening you could have been greatening they could have been greatening

Negation

Simple form	V-ing form
I could not greaten you could not greaten she could not greaten we could not greaten you could not greaten they could not greaten	I could not be greatening you could not be greatening she could not be greatening we could not be greatening you could not be greatening they could not be greatening
Perfect	V-ing perfect
I could not have greatened you could not have greatened she could not have greatened we could not have greatened you could not have greatened they could not have greatened	I could not have been greatening you could not have been greatening she could not have been greatening we could not have been greatening you could not have been greatening they could not have been greatening

Interrogative form

Simple form	V-ing form
could I greaten? could you greaten? could she greaten? could we greaten? could you greaten? could they greaten?	could I be greatening? could you be greatening? could she be greatening? could we be greatening? could you be greatening? could they be greatening?
Perfect	V-ing perfect
could I have greatened? could you have greatened? could she have greatened? could we have greatened? could you have greatened? could they have greatened?	could I have been greatening? could you have been greatening? could she have been greatening? could we have been greatening? could you have been greatening? could they have been greatening?

Interro-negative form

Simple form	V-ing form
could I not greaten? could you not greaten? could she not greaten? could we not greaten? could you not greaten? could they not greaten?	could I not be greatening? could you not be greatening? could she not be greatening? could we not be greatening? could you not be greatening? could they not be greatening?
Perfect	V-ing perfect
could I not have greatened? could you not have greatened? could she not have greatened? could we not have greatened? could you not have greatened? could they not have greatened?	could I not have been greatening? could you not have been greatening? could she not have been greatening? could we not have been greatening? could you not have been greatening? could they not have been greatening?