English verb conjugation
MUST SHACK

Regular verb: shack - shacked - shacked

Affirmation

Simple form	V-ing form
I must shack you must shack she must shack we must shack you must shack they must shack	I must be shacking you must be shacking she must be shacking we must be shacking you must be shacking they must be shacking
Perfect	V-ing perfect
I must have shacked you must have shacked she must have shacked we must have shacked you must have shacked they must have shacked	I must have been shacking you must have been shacking she must have been shacking we must have been shacking you must have been shacking they must have been shacking

Negation

Simple form	V-ing form
I mustn't shack you mustn't shack she mustn't shack we mustn't shack you mustn't shack they mustn't shack	I mustn't be shacking you mustn't be shacking she mustn't be shacking we mustn't be shacking you mustn't be shacking they mustn't be shacking
Perfect	V-ing perfect
I mustn't have shacked you mustn't have shacked she mustn't have shacked we mustn't have shacked you mustn't have shacked they mustn't have shacked	I mustn't have been shacking you mustn't have been shacking she mustn't have been shacking we mustn't have been shacking you mustn't have been shacking they mustn't have been shacking

Interrogative form

Simple form	V-ing form
must I shack? must you shack? must she shack? must we shack? must you shack? must they shack?	must I be shacking? must you be shacking? must she be shacking? must we be shacking? must you be shacking? must they be shacking?
Perfect	V-ing perfect
must I have shacked? must you have shacked? must she have shacked? must we have shacked? must you have shacked? must they have shacked?	must I have been shacking? must you have been shacking? must she have been shacking? must we have been shacking? must you have been shacking? must they have been shacking?

Interro-negative form

Simple form	V-ing form
mustn't I shack? mustn't you shack? mustn't she shack? mustn't we shack? mustn't you shack? mustn't they shack?	mustn't I be shacking? mustn't you be shacking? mustn't she be shacking? mustn't we be shacking? mustn't you be shacking? mustn't they be shacking?
Perfect	V-ing perfect
mustn't I have shacked? mustn't you have shacked? mustn't she have shacked? mustn't we have shacked? mustn't you have shacked? mustn't they have shacked?	mustn't I have been shacking? mustn't you have been shacking? mustn't she have been shacking? mustn't we have been shacking? mustn't you have been shacking? mustn't they have been shacking?