may retard
Regular verb: retard - retarded- retarded

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