English verb conjugation
COULD BALL

Regular verb: ball - balled - balled

Affirmation

Simple form	V-ing form
I could ball you could ball he could ball we could ball you could ball they could ball	I could be balling you could be balling he 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 he 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 he 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 he 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 he 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 he 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 he 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 he ball? could we ball? could you ball? could they ball?	could I be balling? could you be balling? could he 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 he 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 he 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 he 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 he 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 he 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 he not have been balling? could we not have been balling? could you not have been balling? could they not have been balling?