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 must not ball
you must not ball
he must not ball
we must not ball
you must not ball
they must not ball 	I must not be balling
you must not be balling
he must not be balling
we must not be balling
you must not be balling
they must not be balling	I must not have balled
you must not have balled
he must not have balled
we must not have balled
you must not have balled
they must not have balled	I must not have been balling
you must not have been balling
he must not have been balling
we must not have been balling
you must not have been balling
they must not 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 	
must I not ball?
must you not ball?
must he not ball?
must we not ball?
must you not ball?
must they not ball? 	must I not be balling?
must you not be balling?
must he not be balling?
must we not be balling?
must you not be balling?
must they not be balling? 	must I not have balled?
must you not have balled?
must he not have balled?
must we not have balled?
must you not have balled?
must they not have balled? 	must I not have been balling?
must you not have been balling?
must he not have been balling?
must we not have been balling?
must you not have been balling?
must they not have been balling?