English verb conjugation
MUST FLACK

Regular verb: flack - flacked - flacked

Affirmation

Simple form	V-ing form
I must flack you must flack she must flack we must flack you must flack they must flack	I must be flacking you must be flacking she 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 she 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 she 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 must not flack you must not flack she must not flack we must not flack you must not flack they must not flack	I must not be flacking you must not be flacking she must not be flacking we must not be flacking you must not be flacking they must not be flacking
Perfect	V-ing perfect
I must not have flacked you must not have flacked she must not have flacked we must not have flacked you must not have flacked they must not have flacked	I must not have been flacking you must not have been flacking she must not have been flacking we must not have been flacking you must not have been flacking they must not have been flacking

Interrogative form

Simple form	V-ing form
must I flack? must you flack? must she flack? must we flack? must you flack? must they flack?	must I be flacking? must you be flacking? must she 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 she 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 she 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
must I not flack? must you not flack? must she not flack? must we not flack? must you not flack? must they not flack?	must I not be flacking? must you not be flacking? must she not be flacking? must we not be flacking? must you not be flacking? must they not be flacking?
Perfect	V-ing perfect
must I not have flacked? must you not have flacked? must she not have flacked? must we not have flacked? must you not have flacked? must they not have flacked?	must I not have been flacking? must you not have been flacking? must she not have been flacking? must we not have been flacking? must you not have been flacking? must they not have been flacking?