English verb conjugation
COULD BALL

Regular verb: ball - balled - balled

Affirmation

Simple form	V-ing form
I could ball you could ball she could ball we could ball you could ball they could ball	I could be balling you could be balling she could be balling we could be balling you could be balling they could be balling
Perfect	V-ing perfect
I could have balled you could have balled she could have balled we could have balled you could have balled they could have balled	I could have been balling you could have been balling she could have been balling we could have been balling you could have been balling they could have been balling

Negation

Simple form	V-ing form
I could not ball you could not ball she could not ball we could not ball you could not ball they could not ball	I could not be balling you could not be balling she could not be balling we could not be balling you could not be balling they could not be balling
Perfect	V-ing perfect
I could not have balled you could not have balled she could not have balled we could not have balled you could not have balled they could not have balled	I could not have been balling you could not have been balling she could not have been balling we could not have been balling you could not have been balling they could not have been balling

Interrogative form

Simple form	V-ing form
could I ball? could you ball? could she ball? could we ball? could you ball? could they ball?	could I be balling? could you be balling? could she be balling? could we be balling? could you be balling? could they be balling?
Perfect	V-ing perfect
could I have balled? could you have balled? could she have balled? could we have balled? could you have balled? could they have balled?	could I have been balling? could you have been balling? could she have been balling? could we have been balling? could you have been balling? could they have been balling?

Interro-negative form

Simple form	V-ing form
could I not ball? could you not ball? could she not ball? could we not ball? could you not ball? could they not ball?	could I not be balling? could you not be balling? could she not be balling? could we not be balling? could you not be balling? could they not be balling?
Perfect	V-ing perfect
could I not have balled? could you not have balled? could she not have balled? could we not have balled? could you not have balled? could they not have balled?	could I not have been balling? could you not have been balling? could she not have been balling? could we not have been balling? could you not have been balling? could they not have been balling?