English verb conjugation
MUST SACK SACK

Regular verb: sack sack - sack sacked - sack sacked

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I must sack sack you must sack sack he must sack sack we must sack sack you must sack sack they must sack sack	I must be sack sacking you must be sack sacking he must be sack sacking we must be sack sacking you must be sack sacking they must be sack sacking
Perfect	V-ing perfect
I must have sack sacked you must have sack sacked he must have sack sacked we must have sack sacked you must have sack sacked they must have sack sacked	I must have been sack sacking you must have been sack sacking he must have been sack sacking we must have been sack sacking you must have been sack sacking they must have been sack sacking

Negation

Simple form	V-ing form
I must not sack sack you must not sack sack he must not sack sack we must not sack sack you must not sack sack they must not sack sack	I must not be sack sacking you must not be sack sacking he must not be sack sacking we must not be sack sacking you must not be sack sacking they must not be sack sacking
Perfect	V-ing perfect
I must not have sack sacked you must not have sack sacked he must not have sack sacked we must not have sack sacked you must not have sack sacked they must not have sack sacked	I must not have been sack sacking you must not have been sack sacking he must not have been sack sacking we must not have been sack sacking you must not have been sack sacking they must not have been sack sacking

Interrogative form

Simple form	V-ing form
must I sack sack? must you sack sack? must he sack sack? must we sack sack? must you sack sack? must they sack sack?	must I be sack sacking? must you be sack sacking? must he be sack sacking? must we be sack sacking? must you be sack sacking? must they be sack sacking?
Perfect	V-ing perfect
must I have sack sacked? must you have sack sacked? must he have sack sacked? must we have sack sacked? must you have sack sacked? must they have sack sacked?	must I have been sack sacking? must you have been sack sacking? must he have been sack sacking? must we have been sack sacking? must you have been sack sacking? must they have been sack sacking?

Interro-negative form

Simple form	V-ing form
must I not sack sack? must you not sack sack? must he not sack sack? must we not sack sack? must you not sack sack? must they not sack sack?	must I not be sack sacking? must you not be sack sacking? must he not be sack sacking? must we not be sack sacking? must you not be sack sacking? must they not be sack sacking?
Perfect	V-ing perfect
must I not have sack sacked? must you not have sack sacked? must he not have sack sacked? must we not have sack sacked? must you not have sack sacked? must they not have sack sacked?	must I not have been sack sacking? must you not have been sack sacking? must he not have been sack sacking? must we not have been sack sacking? must you not have been sack sacking? must they not have been sack sacking?