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 couldn't jack you couldn't jack he couldn't jack we couldn't jack you couldn't jack they couldn't jack	I couldn't be jacking you couldn't be jacking he couldn't be jacking we couldn't be jacking you couldn't be jacking they couldn't be jacking
Perfect	V-ing perfect
I couldn't have jacked you couldn't have jacked he couldn't have jacked we couldn't have jacked you couldn't have jacked they couldn't have jacked	I couldn't have been jacking you couldn't have been jacking he couldn't have been jacking we couldn't have been jacking you couldn't have been jacking they couldn't 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
couldn't I jack? couldn't you jack? couldn't he jack? couldn't we jack? couldn't you jack? couldn't they jack?	couldn't I be jacking? couldn't you be jacking? couldn't he be jacking? couldn't we be jacking? couldn't you be jacking? couldn't they be jacking?
Perfect	V-ing perfect
couldn't I have jacked? couldn't you have jacked? couldn't he have jacked? couldn't we have jacked? couldn't you have jacked? couldn't they have jacked?	couldn't I have been jacking? couldn't you have been jacking? couldn't he have been jacking? couldn't we have been jacking? couldn't you have been jacking? couldn't they have been jacking?