could end
Regular verb: end - ended- ended

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?