could attack
Regular verb: attack - attacked- attacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could attack
you could attack
she could attack
we could attack
you could attack
they could attack 	I could be attacking
you could be attacking
she could be attacking
we could be attacking
you could be attacking
they could be attacking	I could have attacked
you could have attacked
she could have attacked
we could have attacked
you could have attacked
they could have attacked	I could have been attacking
you could have been attacking
she could have been attacking
we could have been attacking
you could have been attacking
they could have been attacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't attack
you couldn't attack
she couldn't attack
we couldn't attack
you couldn't attack
they couldn't attack 	I couldn't be attacking
you couldn't be attacking
she couldn't be attacking
we couldn't be attacking
you couldn't be attacking
they couldn't be attacking	I couldn't have attacked
you couldn't have attacked
she couldn't have attacked
we couldn't have attacked
you couldn't have attacked
they couldn't have attacked	I couldn't have been attacking
you couldn't have been attacking
she couldn't have been attacking
we couldn't have been attacking
you couldn't have been attacking
they couldn't have been attacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I attack?
could you attack?
could she attack?
could we attack?
could you attack?
could they attack? 	could I be attacking?
could you be attacking?
could she be attacking?
could we be attacking?
could you be attacking?
could they be attacking? 	could I have attacked?
could you have attacked?
could she have attacked?
could we have attacked?
could you have attacked?
could they have attacked? 	could I have been attacking?
could you have been attacking?
could she have been attacking?
could we have been attacking?
could you have been attacking?
could they have been attacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I attack?
couldn't you attack?
couldn't she attack?
couldn't we attack?
couldn't you attack?
couldn't they attack? 	couldn't I be attacking?
couldn't you be attacking?
couldn't she be attacking?
couldn't we be attacking?
couldn't you be attacking?
couldn't they be attacking? 	couldn't I have attacked?
couldn't you have attacked?
couldn't she have attacked?
couldn't we have attacked?
couldn't you have attacked?
couldn't they have attacked? 	couldn't I have been attacking?
couldn't you have been attacking?
couldn't she have been attacking?
couldn't we have been attacking?
couldn't you have been attacking?
couldn't they have been attacking?