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