English verb conjugation
CAN RETROGRESS

Regular verb: retrogress - retrogressed - retrogressed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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