could assail
Regular verb: assail - assailed- assailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could assail
you could assail
she could assail
we could assail
you could assail
they could assail 	I could be assailing
you could be assailing
she could be assailing
we could be assailing
you could be assailing
they could be assailing	I could have assailed
you could have assailed
she could have assailed
we could have assailed
you could have assailed
they could have assailed	I could have been assailing
you could have been assailing
she could have been assailing
we could have been assailing
you could have been assailing
they could have been assailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't assail
you couldn't assail
she couldn't assail
we couldn't assail
you couldn't assail
they couldn't assail 	I couldn't be assailing
you couldn't be assailing
she couldn't be assailing
we couldn't be assailing
you couldn't be assailing
they couldn't be assailing	I couldn't have assailed
you couldn't have assailed
she couldn't have assailed
we couldn't have assailed
you couldn't have assailed
they couldn't have assailed	I couldn't have been assailing
you couldn't have been assailing
she couldn't have been assailing
we couldn't have been assailing
you couldn't have been assailing
they couldn't have been assailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I assail?
could you assail?
could she assail?
could we assail?
could you assail?
could they assail? 	could I be assailing?
could you be assailing?
could she be assailing?
could we be assailing?
could you be assailing?
could they be assailing? 	could I have assailed?
could you have assailed?
could she have assailed?
could we have assailed?
could you have assailed?
could they have assailed? 	could I have been assailing?
could you have been assailing?
could she have been assailing?
could we have been assailing?
could you have been assailing?
could they have been assailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I assail?
couldn't you assail?
couldn't she assail?
couldn't we assail?
couldn't you assail?
couldn't they assail? 	couldn't I be assailing?
couldn't you be assailing?
couldn't she be assailing?
couldn't we be assailing?
couldn't you be assailing?
couldn't they be assailing? 	couldn't I have assailed?
couldn't you have assailed?
couldn't she have assailed?
couldn't we have assailed?
couldn't you have assailed?
couldn't they have assailed? 	couldn't I have been assailing?
couldn't you have been assailing?
couldn't she have been assailing?
couldn't we have been assailing?
couldn't you have been assailing?
couldn't they have been assailing?