English verb conjugation
CAN RETROGRESS

Regular verb: retrogress - retrogressed - retrogressed

Affirmation

Simple form	V-ing form
I can retrogress you can retrogress she can retrogress we can retrogress you can retrogress they can retrogress	I can be retrogressing you can be retrogressing she 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 she 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 she 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 cannot retrogress you cannot retrogress she cannot retrogress we cannot retrogress you cannot retrogress they cannot retrogress	I cannot be retrogressing you cannot be retrogressing she cannot be retrogressing we cannot be retrogressing you cannot be retrogressing they cannot be retrogressing
Perfect	V-ing perfect
I cannot have retrogressed you cannot have retrogressed she cannot have retrogressed we cannot have retrogressed you cannot have retrogressed they cannot have retrogressed	I cannot have been retrogressing you cannot have been retrogressing she cannot have been retrogressing we cannot have been retrogressing you cannot have been retrogressing they cannot have been retrogressing

Interrogative form

Simple form	V-ing form
can I retrogress? can you retrogress? can she retrogress? can we retrogress? can you retrogress? can they retrogress?	can I be retrogressing? can you be retrogressing? can she 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 she 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 she 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 I not retrogress? can you not retrogress? can she not retrogress? can we not retrogress? can you not retrogress? can they not retrogress?	can I not be retrogressing? can you not be retrogressing? can she not be retrogressing? can we not be retrogressing? can you not be retrogressing? can they not be retrogressing?
Perfect	V-ing perfect
can I not have retrogressed? can you not have retrogressed? can she not have retrogressed? can we not have retrogressed? can you not have retrogressed? can they not have retrogressed?	can I not have been retrogressing? can you not have been retrogressing? can she not have been retrogressing? can we not have been retrogressing? can you not have been retrogressing? can they not have been retrogressing?