English verb conjugation
MUST JACK

Regular verb: jack - jacked - jacked

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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