English verb conjugation
COULD END

Regular verb: end - ended - ended

Affirmation

Simple form	V-ing form
I could end you could end she could end we could end you could end they could end	I could be ending you could be ending she could be ending we could be ending you could be ending they could be ending
Perfect	V-ing perfect
I could have ended you could have ended she could have ended we could have ended you could have ended they could have ended	I could have been ending you could have been ending she could have been ending we could have been ending you could have been ending they could have been ending

Negation

Simple form	V-ing form
I could not end you could not end she could not end we could not end you could not end they could not end	I could not be ending you could not be ending she could not be ending we could not be ending you could not be ending they could not be ending
Perfect	V-ing perfect
I could not have ended you could not have ended she could not have ended we could not have ended you could not have ended they could not have ended	I could not have been ending you could not have been ending she could not have been ending we could not have been ending you could not have been ending they could not have been ending

Interrogative form

Simple form	V-ing form
could I end? could you end? could she end? could we end? could you end? could they end?	could I be ending? could you be ending? could she be ending? could we be ending? could you be ending? could they be ending?
Perfect	V-ing perfect
could I have ended? could you have ended? could she have ended? could we have ended? could you have ended? could they have ended?	could I have been ending? could you have been ending? could she have been ending? could we have been ending? could you have been ending? could they have been ending?

Interro-negative form

Simple form	V-ing form
could I not end? could you not end? could she not end? could we not end? could you not end? could they not end?	could I not be ending? could you not be ending? could she not be ending? could we not be ending? could you not be ending? could they not be ending?
Perfect	V-ing perfect
could I not have ended? could you not have ended? could she not have ended? could we not have ended? could you not have ended? could they not have ended?	could I not have been ending? could you not have been ending? could she not have been ending? could we not have been ending? could you not have been ending? could they not have been ending?