must prevail
Verbo regular: prevail - prevailed- prevailed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must prevail
you must prevail
he must prevail
we must prevail
you must prevail
they must prevail 	I must be prevailing
you must be prevailing
he must be prevailing
we must be prevailing
you must be prevailing
they must be prevailing	I must have prevailed
you must have prevailed
he must have prevailed
we must have prevailed
you must have prevailed
they must have prevailed	I must have been prevailing
you must have been prevailing
he must have been prevailing
we must have been prevailing
you must have been prevailing
they must have been prevailing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not prevail
you must not prevail
he must not prevail
we must not prevail
you must not prevail
they must not prevail 	I must not be prevailing
you must not be prevailing
he must not be prevailing
we must not be prevailing
you must not be prevailing
they must not be prevailing	I must not have prevailed
you must not have prevailed
he must not have prevailed
we must not have prevailed
you must not have prevailed
they must not have prevailed	I must not have been prevailing
you must not have been prevailing
he must not have been prevailing
we must not have been prevailing
you must not have been prevailing
they must not have been prevailing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I prevail?
must you prevail?
must he prevail?
must we prevail?
must you prevail?
must they prevail? 	must I be prevailing?
must you be prevailing?
must he be prevailing?
must we be prevailing?
must you be prevailing?
must they be prevailing? 	must I have prevailed?
must you have prevailed?
must he have prevailed?
must we have prevailed?
must you have prevailed?
must they have prevailed? 	must I have been prevailing?
must you have been prevailing?
must he have been prevailing?
must we have been prevailing?
must you have been prevailing?
must they have been prevailing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not prevail?
must you not prevail?
must he not prevail?
must we not prevail?
must you not prevail?
must they not prevail? 	must I not be prevailing?
must you not be prevailing?
must he not be prevailing?
must we not be prevailing?
must you not be prevailing?
must they not be prevailing? 	must I not have prevailed?
must you not have prevailed?
must he not have prevailed?
must we not have prevailed?
must you not have prevailed?
must they not have prevailed? 	must I not have been prevailing?
must you not have been prevailing?
must he not have been prevailing?
must we not have been prevailing?
must you not have been prevailing?
must they not have been prevailing?