could prevail
Verbo regular: prevail - prevailed- prevailed

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

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't prevail
you couldn't prevail
he couldn't prevail
we couldn't prevail
you couldn't prevail
they couldn't prevail 	I couldn't be prevailing
you couldn't be prevailing
he couldn't be prevailing
we couldn't be prevailing
you couldn't be prevailing
they couldn't be prevailing	I couldn't have prevailed
you couldn't have prevailed
he couldn't have prevailed
we couldn't have prevailed
you couldn't have prevailed
they couldn't have prevailed	I couldn't have been prevailing
you couldn't have been prevailing
he couldn't have been prevailing
we couldn't have been prevailing
you couldn't have been prevailing
they couldn't have been prevailing	

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

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