can attack
Regular verb: attack - attacked- attacked

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot attack
you cannot attack
he cannot attack
we cannot attack
you cannot attack
they cannot attack 	I cannot be attacking
you cannot be attacking
he cannot be attacking
we cannot be attacking
you cannot be attacking
they cannot be attacking	I cannot have attacked
you cannot have attacked
he cannot have attacked
we cannot have attacked
you cannot have attacked
they cannot have attacked	I cannot have been attacking
you cannot have been attacking
he cannot have been attacking
we cannot have been attacking
you cannot have been attacking
they cannot have been attacking	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not attack?
can you not attack?
can he not attack?
can we not attack?
can you not attack?
can they not attack? 	can I not be attacking?
can you not be attacking?
can he not be attacking?
can we not be attacking?
can you not be attacking?
can they not be attacking? 	can I not have attacked?
can you not have attacked?
can he not have attacked?
can we not have attacked?
can you not have attacked?
can they not have attacked? 	can I not have been attacking?
can you not have been attacking?
can he not have been attacking?
can we not have been attacking?
can you not have been attacking?
can they not have been attacking?