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 couldn't end you couldn't end she couldn't end we couldn't end you couldn't end they couldn't end	I couldn't be ending you couldn't be ending she couldn't be ending we couldn't be ending you couldn't be ending they couldn't be ending
Perfect	V-ing perfect
I couldn't have ended you couldn't have ended she couldn't have ended we couldn't have ended you couldn't have ended they couldn't have ended	I couldn't have been ending you couldn't have been ending she couldn't have been ending we couldn't have been ending you couldn't have been ending they couldn't 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
couldn't I end? couldn't you end? couldn't she end? couldn't we end? couldn't you end? couldn't they end?	couldn't I be ending? couldn't you be ending? couldn't she be ending? couldn't we be ending? couldn't you be ending? couldn't they be ending?
Perfect	V-ing perfect
couldn't I have ended? couldn't you have ended? couldn't she have ended? couldn't we have ended? couldn't you have ended? couldn't they have ended?	couldn't I have been ending? couldn't you have been ending? couldn't she have been ending? couldn't we have been ending? couldn't you have been ending? couldn't they have been ending?