English verb conjugation
SHOULD RETROGRESS

Regular verb: retrogress - retrogressed - retrogressed

Affirmation

Simple form	V-ing form
I'd retrogress you'd retrogress she'd retrogress we'd retrogress you'd retrogress they'd retrogress	I'd be retrogressing you'd be retrogressing she'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 she 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 she 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 she 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 she 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 she 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 she 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 she retrogress? should we retrogress? should you retrogress? should they retrogress?	should I be retrogressing? should you be retrogressing? should she 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 she 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 she 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 she 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 she 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 she 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 she have been retrogressing? shouldn't we have been retrogressing? shouldn't you have been retrogressing? shouldn't they have been retrogressing?