could prevail
Regular verb: prevail - prevailed- prevailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could prevail
you could prevail
she could prevail
we could prevail
you could prevail
they could prevail 	I could be prevailing
you could be prevailing
she could be prevailing
we could be prevailing
you could be prevailing
they could be prevailing	I could have prevailed
you could have prevailed
she 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
she could have been prevailing
we could have been prevailing
you could have been prevailing
they could have been prevailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't prevail
you couldn't prevail
she 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
she 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
she 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
she couldn't have been prevailing
we couldn't have been prevailing
you couldn't have been prevailing
they couldn't have been prevailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I prevail?
could you prevail?
could she prevail?
could we prevail?
could you prevail?
could they prevail? 	could I be prevailing?
could you be prevailing?
could she be prevailing?
could we be prevailing?
could you be prevailing?
could they be prevailing? 	could I have prevailed?
could you have prevailed?
could she 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 she have been prevailing?
could we have been prevailing?
could you have been prevailing?
could they have been prevailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I prevail?
couldn't you prevail?
couldn't she 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 she 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 she 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 she have been prevailing?
couldn't we have been prevailing?
couldn't you have been prevailing?
couldn't they have been prevailing?