can retard
Regular verb: retard - retarded- retarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can retard
you can retard
she can retard
we can retard
you can retard
they can retard 	I can be retarding
you can be retarding
she can be retarding
we can be retarding
you can be retarding
they can be retarding	I can have retarded
you can have retarded
she can have retarded
we can have retarded
you can have retarded
they can have retarded	I can have been retarding
you can have been retarding
she can have been retarding
we can have been retarding
you can have been retarding
they can have been retarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't retard
you can't retard
she can't retard
we can't retard
you can't retard
they can't retard 	I can't be retarding
you can't be retarding
she can't be retarding
we can't be retarding
you can't be retarding
they can't be retarding	I can't have retarded
you can't have retarded
she can't have retarded
we can't have retarded
you can't have retarded
they can't have retarded	I can't have been retarding
you can't have been retarding
she can't have been retarding
we can't have been retarding
you can't have been retarding
they can't have been retarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I retard?
can you retard?
can she retard?
can we retard?
can you retard?
can they retard? 	can I be retarding?
can you be retarding?
can she be retarding?
can we be retarding?
can you be retarding?
can they be retarding? 	can I have retarded?
can you have retarded?
can she have retarded?
can we have retarded?
can you have retarded?
can they have retarded? 	can I have been retarding?
can you have been retarding?
can she have been retarding?
can we have been retarding?
can you have been retarding?
can they have been retarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I retard?
can't you retard?
can't she retard?
can't we retard?
can't you retard?
can't they retard? 	can't I be retarding?
can't you be retarding?
can't she be retarding?
can't we be retarding?
can't you be retarding?
can't they be retarding? 	can't I have retarded?
can't you have retarded?
can't she have retarded?
can't we have retarded?
can't you have retarded?
can't they have retarded? 	can't I have been retarding?
can't you have been retarding?
can't she have been retarding?
can't we have been retarding?
can't you have been retarding?
can't they have been retarding?