must pile
Verbo regular: pile - piled- piled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must pile
you must pile
he must pile
we must pile
you must pile
they must pile 	I must be piling
you must be piling
he must be piling
we must be piling
you must be piling
they must be piling	I must have piled
you must have piled
he must have piled
we must have piled
you must have piled
they must have piled	I must have been piling
you must have been piling
he must have been piling
we must have been piling
you must have been piling
they must have been piling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not pile
you must not pile
he must not pile
we must not pile
you must not pile
they must not pile 	I must not be piling
you must not be piling
he must not be piling
we must not be piling
you must not be piling
they must not be piling	I must not have piled
you must not have piled
he must not have piled
we must not have piled
you must not have piled
they must not have piled	I must not have been piling
you must not have been piling
he must not have been piling
we must not have been piling
you must not have been piling
they must not have been piling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I pile?
must you pile?
must he pile?
must we pile?
must you pile?
must they pile? 	must I be piling?
must you be piling?
must he be piling?
must we be piling?
must you be piling?
must they be piling? 	must I have piled?
must you have piled?
must he have piled?
must we have piled?
must you have piled?
must they have piled? 	must I have been piling?
must you have been piling?
must he have been piling?
must we have been piling?
must you have been piling?
must they have been piling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not pile?
must you not pile?
must he not pile?
must we not pile?
must you not pile?
must they not pile? 	must I not be piling?
must you not be piling?
must he not be piling?
must we not be piling?
must you not be piling?
must they not be piling? 	must I not have piled?
must you not have piled?
must he not have piled?
must we not have piled?
must you not have piled?
must they not have piled? 	must I not have been piling?
must you not have been piling?
must he not have been piling?
must we not have been piling?
must you not have been piling?
must they not have been piling?