can ball
Regular verb: ball - balled- balled

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

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

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

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