English verb conjugation
CAN JACK

Regular verb: jack - jacked - jacked

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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