English verb conjugation
MUST SLACK

Regular verb: slack - slacked - slacked

Affirmation

Simple form	V-ing form
I must slack you must slack he must slack we must slack you must slack they must slack	I must be slacking you must be slacking he must be slacking we must be slacking you must be slacking they must be slacking
Perfect	V-ing perfect
I must have slacked you must have slacked he must have slacked we must have slacked you must have slacked they must have slacked	I must have been slacking you must have been slacking he must have been slacking we must have been slacking you must have been slacking they must have been slacking

Negation

Simple form	V-ing form
I mustn't slack you mustn't slack he mustn't slack we mustn't slack you mustn't slack they mustn't slack	I mustn't be slacking you mustn't be slacking he mustn't be slacking we mustn't be slacking you mustn't be slacking they mustn't be slacking
Perfect	V-ing perfect
I mustn't have slacked you mustn't have slacked he mustn't have slacked we mustn't have slacked you mustn't have slacked they mustn't have slacked	I mustn't have been slacking you mustn't have been slacking he mustn't have been slacking we mustn't have been slacking you mustn't have been slacking they mustn't have been slacking

Interrogative form

Simple form	V-ing form
must I slack? must you slack? must he slack? must we slack? must you slack? must they slack?	must I be slacking? must you be slacking? must he be slacking? must we be slacking? must you be slacking? must they be slacking?
Perfect	V-ing perfect
must I have slacked? must you have slacked? must he have slacked? must we have slacked? must you have slacked? must they have slacked?	must I have been slacking? must you have been slacking? must he have been slacking? must we have been slacking? must you have been slacking? must they have been slacking?

Interro-negative form

Simple form	V-ing form
mustn't I slack? mustn't you slack? mustn't he slack? mustn't we slack? mustn't you slack? mustn't they slack?	mustn't I be slacking? mustn't you be slacking? mustn't he be slacking? mustn't we be slacking? mustn't you be slacking? mustn't they be slacking?
Perfect	V-ing perfect
mustn't I have slacked? mustn't you have slacked? mustn't he have slacked? mustn't we have slacked? mustn't you have slacked? mustn't they have slacked?	mustn't I have been slacking? mustn't you have been slacking? mustn't he have been slacking? mustn't we have been slacking? mustn't you have been slacking? mustn't they have been slacking?