must demonstrate
Verbo regular: demonstrate - demonstrated- demonstrated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must demonstrate
you must demonstrate
she must demonstrate
we must demonstrate
you must demonstrate
they must demonstrate 	I must be demonstrating
you must be demonstrating
she must be demonstrating
we must be demonstrating
you must be demonstrating
they must be demonstrating	I must have demonstrated
you must have demonstrated
she must have demonstrated
we must have demonstrated
you must have demonstrated
they must have demonstrated	I must have been demonstrating
you must have been demonstrating
she must have been demonstrating
we must have been demonstrating
you must have been demonstrating
they must have been demonstrating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't demonstrate
you mustn't demonstrate
she mustn't demonstrate
we mustn't demonstrate
you mustn't demonstrate
they mustn't demonstrate 	I mustn't be demonstrating
you mustn't be demonstrating
she mustn't be demonstrating
we mustn't be demonstrating
you mustn't be demonstrating
they mustn't be demonstrating	I mustn't have demonstrated
you mustn't have demonstrated
she mustn't have demonstrated
we mustn't have demonstrated
you mustn't have demonstrated
they mustn't have demonstrated	I mustn't have been demonstrating
you mustn't have been demonstrating
she mustn't have been demonstrating
we mustn't have been demonstrating
you mustn't have been demonstrating
they mustn't have been demonstrating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I demonstrate?
must you demonstrate?
must she demonstrate?
must we demonstrate?
must you demonstrate?
must they demonstrate? 	must I be demonstrating?
must you be demonstrating?
must she be demonstrating?
must we be demonstrating?
must you be demonstrating?
must they be demonstrating? 	must I have demonstrated?
must you have demonstrated?
must she have demonstrated?
must we have demonstrated?
must you have demonstrated?
must they have demonstrated? 	must I have been demonstrating?
must you have been demonstrating?
must she have been demonstrating?
must we have been demonstrating?
must you have been demonstrating?
must they have been demonstrating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I demonstrate?
mustn't you demonstrate?
mustn't she demonstrate?
mustn't we demonstrate?
mustn't you demonstrate?
mustn't they demonstrate? 	mustn't I be demonstrating?
mustn't you be demonstrating?
mustn't she be demonstrating?
mustn't we be demonstrating?
mustn't you be demonstrating?
mustn't they be demonstrating? 	mustn't I have demonstrated?
mustn't you have demonstrated?
mustn't she have demonstrated?
mustn't we have demonstrated?
mustn't you have demonstrated?
mustn't they have demonstrated? 	mustn't I have been demonstrating?
mustn't you have been demonstrating?
mustn't she have been demonstrating?
mustn't we have been demonstrating?
mustn't you have been demonstrating?
mustn't they have been demonstrating?