English verb conjugation
MUST FLACK

Regular verb: flack - flacked - flacked

Affirmation

Simple form	V-ing form
I must flack you must flack he must flack we must flack you must flack they must flack	I must be flacking you must be flacking he must be flacking we must be flacking you must be flacking they must be flacking
Perfect	V-ing perfect
I must have flacked you must have flacked he must have flacked we must have flacked you must have flacked they must have flacked	I must have been flacking you must have been flacking he must have been flacking we must have been flacking you must have been flacking they must have been flacking

Negation

Simple form	V-ing form
I mustn't flack you mustn't flack he mustn't flack we mustn't flack you mustn't flack they mustn't flack	I mustn't be flacking you mustn't be flacking he mustn't be flacking we mustn't be flacking you mustn't be flacking they mustn't be flacking
Perfect	V-ing perfect
I mustn't have flacked you mustn't have flacked he mustn't have flacked we mustn't have flacked you mustn't have flacked they mustn't have flacked	I mustn't have been flacking you mustn't have been flacking he mustn't have been flacking we mustn't have been flacking you mustn't have been flacking they mustn't have been flacking

Interrogative form

Simple form	V-ing form
must I flack? must you flack? must he flack? must we flack? must you flack? must they flack?	must I be flacking? must you be flacking? must he be flacking? must we be flacking? must you be flacking? must they be flacking?
Perfect	V-ing perfect
must I have flacked? must you have flacked? must he have flacked? must we have flacked? must you have flacked? must they have flacked?	must I have been flacking? must you have been flacking? must he have been flacking? must we have been flacking? must you have been flacking? must they have been flacking?

Interro-negative form

Simple form	V-ing form
mustn't I flack? mustn't you flack? mustn't he flack? mustn't we flack? mustn't you flack? mustn't they flack?	mustn't I be flacking? mustn't you be flacking? mustn't he be flacking? mustn't we be flacking? mustn't you be flacking? mustn't they be flacking?
Perfect	V-ing perfect
mustn't I have flacked? mustn't you have flacked? mustn't he have flacked? mustn't we have flacked? mustn't you have flacked? mustn't they have flacked?	mustn't I have been flacking? mustn't you have been flacking? mustn't he have been flacking? mustn't we have been flacking? mustn't you have been flacking? mustn't they have been flacking?