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 must not demonstrate
you must not demonstrate
she must not demonstrate
we must not demonstrate
you must not demonstrate
they must not demonstrate 	I must not be demonstrating
you must not be demonstrating
she must not be demonstrating
we must not be demonstrating
you must not be demonstrating
they must not be demonstrating	I must not have demonstrated
you must not have demonstrated
she must not have demonstrated
we must not have demonstrated
you must not have demonstrated
they must not have demonstrated	I must not have been demonstrating
you must not have been demonstrating
she must not have been demonstrating
we must not have been demonstrating
you must not have been demonstrating
they must not 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 	
must I not demonstrate?
must you not demonstrate?
must she not demonstrate?
must we not demonstrate?
must you not demonstrate?
must they not demonstrate? 	must I not be demonstrating?
must you not be demonstrating?
must she not be demonstrating?
must we not be demonstrating?
must you not be demonstrating?
must they not be demonstrating? 	must I not have demonstrated?
must you not have demonstrated?
must she not have demonstrated?
must we not have demonstrated?
must you not have demonstrated?
must they not have demonstrated? 	must I not have been demonstrating?
must you not have been demonstrating?
must she not have been demonstrating?
must we not have been demonstrating?
must you not have been demonstrating?
must they not have been demonstrating?