English verb conjugation
SHOULD RETROGRESS

Regular verb: retrogress - retrogressed - retrogressed

Affirmation

Simple form	V-ing form
I'd retrogress you'd retrogress he'd retrogress we'd retrogress you'd retrogress they'd retrogress	I'd be retrogressing you'd be retrogressing he'd be retrogressing we'd be retrogressing you'd be retrogressing they'd be retrogressing
Perfect	V-ing perfect
I should've retrogressed you should've retrogressed he should've retrogressed we should've retrogressed you should've retrogressed they should've retrogressed	I should've been retrogressing you should've been retrogressing he should've been retrogressing we should've been retrogressing you should've been retrogressing they should've been retrogressing

Negation

Simple form	V-ing form
I shouldn't retrogress you shouldn't retrogress he shouldn't retrogress we shouldn't retrogress you shouldn't retrogress they shouldn't retrogress	I shouldn't be retrogressing you shouldn't be retrogressing he shouldn't be retrogressing we shouldn't be retrogressing you shouldn't be retrogressing they shouldn't be retrogressing
Perfect	V-ing perfect
I shouldn't have retrogressed you shouldn't have retrogressed he shouldn't have retrogressed we shouldn't have retrogressed you shouldn't have retrogressed they shouldn't have retrogressed	I shouldn't have been retrogressing you shouldn't have been retrogressing he shouldn't have been retrogressing we shouldn't have been retrogressing you shouldn't have been retrogressing they shouldn't have been retrogressing

Interrogative form

Simple form	V-ing form
should I retrogress? should you retrogress? should he retrogress? should we retrogress? should you retrogress? should they retrogress?	should I be retrogressing? should you be retrogressing? should he be retrogressing? should we be retrogressing? should you be retrogressing? should they be retrogressing?
Perfect	V-ing perfect
should I have retrogressed? should you have retrogressed? should he have retrogressed? should we have retrogressed? should you have retrogressed? should they have retrogressed?	should I have been retrogressing? should you have been retrogressing? should he have been retrogressing? should we have been retrogressing? should you have been retrogressing? should they have been retrogressing?

Interro-negative form

Simple form	V-ing form
shouldn't I retrogress? shouldn't you retrogress? shouldn't he retrogress? shouldn't we retrogress? shouldn't you retrogress? shouldn't they retrogress?	shouldn't I be retrogressing? shouldn't you be retrogressing? shouldn't he be retrogressing? shouldn't we be retrogressing? shouldn't you be retrogressing? shouldn't they be retrogressing?
Perfect	V-ing perfect
shouldn't I have retrogressed? shouldn't you have retrogressed? shouldn't he have retrogressed? shouldn't we have retrogressed? shouldn't you have retrogressed? shouldn't they have retrogressed?	shouldn't I have been retrogressing? shouldn't you have been retrogressing? shouldn't he have been retrogressing? shouldn't we have been retrogressing? shouldn't you have been retrogressing? shouldn't they have been retrogressing?