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 mayn't retard you mayn't retard he mayn't retard we mayn't retard you mayn't retard they mayn't retard
V-ing form
I mayn't be retarding you mayn't be retarding he mayn't be retarding we mayn't be retarding you mayn't be retarding they mayn't be retarding
Perfect
I mayn't have retarded you mayn't have retarded he mayn't have retarded we mayn't have retarded you mayn't have retarded they mayn't have retarded
V-ing perfect
I mayn't have been retarding you mayn't have been retarding he mayn't have been retarding we mayn't have been retarding you mayn't have been retarding they mayn't 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
mayn't I retard? mayn't you retard? mayn't he retard? mayn't we retard? mayn't you retard? mayn't they retard?
V-ing form
mayn't I be retarding? mayn't you be retarding? mayn't he be retarding? mayn't we be retarding? mayn't you be retarding? mayn't they be retarding?
Perfect
mayn't I have retarded? mayn't you have retarded? mayn't he have retarded? mayn't we have retarded? mayn't you have retarded? mayn't they have retarded?
V-ing perfect
mayn't I have been retarding? mayn't you have been retarding? mayn't he have been retarding? mayn't we have been retarding? mayn't you have been retarding? mayn't they have been retarding?