English verb conjugation
CAN ATTACK

Regular verb: attack - attacked - attacked

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I can't attack you can't attack he can't attack we can't attack you can't attack they can't attack	I can't be attacking you can't be attacking he can't be attacking we can't be attacking you can't be attacking they can't be attacking
Perfect	V-ing perfect
I can't have attacked you can't have attacked he can't have attacked we can't have attacked you can't have attacked they can't have attacked	I can't have been attacking you can't have been attacking he can't have been attacking we can't have been attacking you can't have been attacking they can't have been attacking

Interrogative form

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