English verb conjugation
COULD ACE

Regular verb: ace - aced - aced

Affirmation

Simple form	V-ing form
I could ace you could ace he could ace we could ace you could ace they could ace	I could be acing you could be acing he could be acing we could be acing you could be acing they could be acing
Perfect	V-ing perfect
I could have aced you could have aced he could have aced we could have aced you could have aced they could have aced	I could have been acing you could have been acing he could have been acing we could have been acing you could have been acing they could have been acing

Negation

Simple form	V-ing form
I could not ace you could not ace he could not ace we could not ace you could not ace they could not ace	I could not be acing you could not be acing he could not be acing we could not be acing you could not be acing they could not be acing
Perfect	V-ing perfect
I could not have aced you could not have aced he could not have aced we could not have aced you could not have aced they could not have aced	I could not have been acing you could not have been acing he could not have been acing we could not have been acing you could not have been acing they could not have been acing

Interrogative form

Simple form	V-ing form
could I ace? could you ace? could he ace? could we ace? could you ace? could they ace?	could I be acing? could you be acing? could he be acing? could we be acing? could you be acing? could they be acing?
Perfect	V-ing perfect
could I have aced? could you have aced? could he have aced? could we have aced? could you have aced? could they have aced?	could I have been acing? could you have been acing? could he have been acing? could we have been acing? could you have been acing? could they have been acing?

Interro-negative form

Simple form	V-ing form
could I not ace? could you not ace? could he not ace? could we not ace? could you not ace? could they not ace?	could I not be acing? could you not be acing? could he not be acing? could we not be acing? could you not be acing? could they not be acing?
Perfect	V-ing perfect
could I not have aced? could you not have aced? could he not have aced? could we not have aced? could you not have aced? could they not have aced?	could I not have been acing? could you not have been acing? could he not have been acing? could we not have been acing? could you not have been acing? could they not have been acing?