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