must ball
Verbo regular: ball - balled- balled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must ball
you must ball
he must ball
we must ball
you must ball
they must ball 	I must be balling
you must be balling
he must be balling
we must be balling
you must be balling
they must be balling	I must have balled
you must have balled
he must have balled
we must have balled
you must have balled
they must have balled	I must have been balling
you must have been balling
he must have been balling
we must have been balling
you must have been balling
they must have been balling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't ball
you mustn't ball
he mustn't ball
we mustn't ball
you mustn't ball
they mustn't ball 	I mustn't be balling
you mustn't be balling
he mustn't be balling
we mustn't be balling
you mustn't be balling
they mustn't be balling	I mustn't have balled
you mustn't have balled
he mustn't have balled
we mustn't have balled
you mustn't have balled
they mustn't have balled	I mustn't have been balling
you mustn't have been balling
he mustn't have been balling
we mustn't have been balling
you mustn't have been balling
they mustn't have been balling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I ball?
must you ball?
must he ball?
must we ball?
must you ball?
must they ball? 	must I be balling?
must you be balling?
must he be balling?
must we be balling?
must you be balling?
must they be balling? 	must I have balled?
must you have balled?
must he have balled?
must we have balled?
must you have balled?
must they have balled? 	must I have been balling?
must you have been balling?
must he have been balling?
must we have been balling?
must you have been balling?
must they have been balling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I ball?
mustn't you ball?
mustn't he ball?
mustn't we ball?
mustn't you ball?
mustn't they ball? 	mustn't I be balling?
mustn't you be balling?
mustn't he be balling?
mustn't we be balling?
mustn't you be balling?
mustn't they be balling? 	mustn't I have balled?
mustn't you have balled?
mustn't he have balled?
mustn't we have balled?
mustn't you have balled?
mustn't they have balled? 	mustn't I have been balling?
mustn't you have been balling?
mustn't he have been balling?
mustn't we have been balling?
mustn't you have been balling?
mustn't they have been balling?