English verb conjugation
COULD JACK

Regular verb: jack - jacked - jacked

Affirmation

Simple form	V-ing form
I could jack you could jack he could jack we could jack you could jack they could jack	I could be jacking you could be jacking he could be jacking we could be jacking you could be jacking they could be jacking
Perfect	V-ing perfect
I could have jacked you could have jacked he could have jacked we could have jacked you could have jacked they could have jacked	I could have been jacking you could have been jacking he could have been jacking we could have been jacking you could have been jacking they could have been jacking

Negation

Simple form	V-ing form
I could not jack you could not jack he could not jack we could not jack you could not jack they could not jack	I could not be jacking you could not be jacking he could not be jacking we could not be jacking you could not be jacking they could not be jacking
Perfect	V-ing perfect
I could not have jacked you could not have jacked he could not have jacked we could not have jacked you could not have jacked they could not have jacked	I could not have been jacking you could not have been jacking he could not have been jacking we could not have been jacking you could not have been jacking they could not have been jacking

Interrogative form

Simple form	V-ing form
could I jack? could you jack? could he jack? could we jack? could you jack? could they jack?	could I be jacking? could you be jacking? could he be jacking? could we be jacking? could you be jacking? could they be jacking?
Perfect	V-ing perfect
could I have jacked? could you have jacked? could he have jacked? could we have jacked? could you have jacked? could they have jacked?	could I have been jacking? could you have been jacking? could he have been jacking? could we have been jacking? could you have been jacking? could they have been jacking?

Interro-negative form

Simple form	V-ing form
could I not jack? could you not jack? could he not jack? could we not jack? could you not jack? could they not jack?	could I not be jacking? could you not be jacking? could he not be jacking? could we not be jacking? could you not be jacking? could they not be jacking?
Perfect	V-ing perfect
could I not have jacked? could you not have jacked? could he not have jacked? could we not have jacked? could you not have jacked? could they not have jacked?	could I not have been jacking? could you not have been jacking? could he not have been jacking? could we not have been jacking? could you not have been jacking? could they not have been jacking?