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 couldn't ball you couldn't ball she couldn't ball we couldn't ball you couldn't ball they couldn't ball	I couldn't be balling you couldn't be balling she couldn't be balling we couldn't be balling you couldn't be balling they couldn't be balling
Perfect	V-ing perfect
I couldn't have balled you couldn't have balled she couldn't have balled we couldn't have balled you couldn't have balled they couldn't have balled	I couldn't have been balling you couldn't have been balling she couldn't have been balling we couldn't have been balling you couldn't have been balling they couldn't 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
couldn't I ball? couldn't you ball? couldn't she ball? couldn't we ball? couldn't you ball? couldn't they ball?	couldn't I be balling? couldn't you be balling? couldn't she be balling? couldn't we be balling? couldn't you be balling? couldn't they be balling?
Perfect	V-ing perfect
couldn't I have balled? couldn't you have balled? couldn't she have balled? couldn't we have balled? couldn't you have balled? couldn't they have balled?	couldn't I have been balling? couldn't you have been balling? couldn't she have been balling? couldn't we have been balling? couldn't you have been balling? couldn't they have been balling?