I may retard you may retard she may retard we may retard you may retard they may retard
V-ing form
I may be retarding you may be retarding she may be retarding we may be retarding you may be retarding they may be retarding
Perfect
I may have retarded you may have retarded she may have retarded we may have retarded you may have retarded they may have retarded
V-ing perfect
I may have been retarding you may have been retarding she may have been retarding we may have been retarding you may have been retarding they may have been retarding
Negation
Simple form
I may not retard you may not retard she may not retard we may not retard you may not retard they may not retard
V-ing form
I may not be retarding you may not be retarding she may not be retarding we may not be retarding you may not be retarding they may not be retarding
Perfect
I may not have retarded you may not have retarded she may not have retarded we may not have retarded you may not have retarded they may not have retarded
V-ing perfect
I may not have been retarding you may not have been retarding she may not have been retarding we may not have been retarding you may not have been retarding they may not have been retarding
Interrogative form
Simple form
may I retard? may you retard? may she retard? may we retard? may you retard? may they retard?
V-ing form
may I be retarding? may you be retarding? may she be retarding? may we be retarding? may you be retarding? may they be retarding?
Perfect
may I have retarded? may you have retarded? may she have retarded? may we have retarded? may you have retarded? may they have retarded?
V-ing perfect
may I have been retarding? may you have been retarding? may she have been retarding? may we have been retarding? may you have been retarding? may they have been retarding?
Interro-negative form
Simple form
may I not retard? may you not retard? may she not retard? may we not retard? may you not retard? may they not retard?
V-ing form
may I not be retarding? may you not be retarding? may she not be retarding? may we not be retarding? may you not be retarding? may they not be retarding?
Perfect
may I not have retarded? may you not have retarded? may she not have retarded? may we not have retarded? may you not have retarded? may they not have retarded?
V-ing perfect
may I not have been retarding? may you not have been retarding? may she not have been retarding? may we not have been retarding? may you not have been retarding? may they not have been retarding?