could assail
Regular verb: assail - assailed- assailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could assail
you could assail
he could assail
we could assail
you could assail
they could assail 	I could be assailing
you could be assailing
he could be assailing
we could be assailing
you could be assailing
they could be assailing	I could have assailed
you could have assailed
he 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
he 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
he 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
he 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
he 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
he 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 he assail?
could we assail?
could you assail?
could they assail? 	could I be assailing?
could you be assailing?
could he be assailing?
could we be assailing?
could you be assailing?
could they be assailing? 	could I have assailed?
could you have assailed?
could he 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 he 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 he 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 he 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 he 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 he have been assailing?
couldn't we have been assailing?
couldn't you have been assailing?
couldn't they have been assailing?