English verb conjugation
MUST JACK

Regular verb: jack - jacked - jacked

Affirmation

Simple form	V-ing form
I must jack you must jack she must jack we must jack you must jack they must jack	I must be jacking you must be jacking she 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 she 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 she 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 mustn't jack you mustn't jack she mustn't jack we mustn't jack you mustn't jack they mustn't jack	I mustn't be jacking you mustn't be jacking she mustn't be jacking we mustn't be jacking you mustn't be jacking they mustn't be jacking
Perfect	V-ing perfect
I mustn't have jacked you mustn't have jacked she mustn't have jacked we mustn't have jacked you mustn't have jacked they mustn't have jacked	I mustn't have been jacking you mustn't have been jacking she mustn't have been jacking we mustn't have been jacking you mustn't have been jacking they mustn't have been jacking

Interrogative form

Simple form	V-ing form
must I jack? must you jack? must she jack? must we jack? must you jack? must they jack?	must I be jacking? must you be jacking? must she 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 she 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 she 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
mustn't I jack? mustn't you jack? mustn't she jack? mustn't we jack? mustn't you jack? mustn't they jack?	mustn't I be jacking? mustn't you be jacking? mustn't she be jacking? mustn't we be jacking? mustn't you be jacking? mustn't they be jacking?
Perfect	V-ing perfect
mustn't I have jacked? mustn't you have jacked? mustn't she have jacked? mustn't we have jacked? mustn't you have jacked? mustn't they have jacked?	mustn't I have been jacking? mustn't you have been jacking? mustn't she have been jacking? mustn't we have been jacking? mustn't you have been jacking? mustn't they have been jacking?