I may retard you may retard he may retard we may retard you may retard they may retard
V-ing form
I may be retarding you may be retarding he may be retarding we may be retarding you may be retarding they may be retarding
Perfect
I may have retarded you may have retarded he 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 he 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 he 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 he 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 he 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 he 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 he retard? may we retard? may you retard? may they retard?
V-ing form
may I be retarding? may you be retarding? may he be retarding? may we be retarding? may you be retarding? may they be retarding?
Perfect
may I have retarded? may you have retarded? may he 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 he 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 he 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 he 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 he 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 he not have been retarding? may we not have been retarding? may you not have been retarding? may they not have been retarding?