English verb conjugation
MUST REGRESS

Regular verb: regress - regressed - regressed

Affirmation

Simple form	V-ing form
I must regress you must regress he must regress we must regress you must regress they must regress	I must be regressing you must be regressing he must be regressing we must be regressing you must be regressing they must be regressing
Perfect	V-ing perfect
I must have regressed you must have regressed he must have regressed we must have regressed you must have regressed they must have regressed	I must have been regressing you must have been regressing he must have been regressing we must have been regressing you must have been regressing they must have been regressing

Negation

Simple form	V-ing form
I must not regress you must not regress he must not regress we must not regress you must not regress they must not regress	I must not be regressing you must not be regressing he must not be regressing we must not be regressing you must not be regressing they must not be regressing
Perfect	V-ing perfect
I must not have regressed you must not have regressed he must not have regressed we must not have regressed you must not have regressed they must not have regressed	I must not have been regressing you must not have been regressing he must not have been regressing we must not have been regressing you must not have been regressing they must not have been regressing

Interrogative form

Simple form	V-ing form
must I regress? must you regress? must he regress? must we regress? must you regress? must they regress?	must I be regressing? must you be regressing? must he be regressing? must we be regressing? must you be regressing? must they be regressing?
Perfect	V-ing perfect
must I have regressed? must you have regressed? must he have regressed? must we have regressed? must you have regressed? must they have regressed?	must I have been regressing? must you have been regressing? must he have been regressing? must we have been regressing? must you have been regressing? must they have been regressing?

Interro-negative form

Simple form	V-ing form
must I not regress? must you not regress? must he not regress? must we not regress? must you not regress? must they not regress?	must I not be regressing? must you not be regressing? must he not be regressing? must we not be regressing? must you not be regressing? must they not be regressing?
Perfect	V-ing perfect
must I not have regressed? must you not have regressed? must he not have regressed? must we not have regressed? must you not have regressed? must they not have regressed?	must I not have been regressing? must you not have been regressing? must he not have been regressing? must we not have been regressing? must you not have been regressing? must they not have been regressing?