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 cannot retard
you cannot retard
she cannot retard
we cannot retard
you cannot retard
they cannot retard 	I cannot be retarding
you cannot be retarding
she cannot be retarding
we cannot be retarding
you cannot be retarding
they cannot be retarding	I cannot have retarded
you cannot have retarded
she cannot have retarded
we cannot have retarded
you cannot have retarded
they cannot have retarded	I cannot have been retarding
you cannot have been retarding
she cannot have been retarding
we cannot have been retarding
you cannot have been retarding
they cannot 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 I not retard?
can you not retard?
can she not retard?
can we not retard?
can you not retard?
can they not retard? 	can I not be retarding?
can you not be retarding?
can she not be retarding?
can we not be retarding?
can you not be retarding?
can they not be retarding? 	can I not have retarded?
can you not have retarded?
can she not have retarded?
can we not have retarded?
can you not have retarded?
can they not have retarded? 	can I not have been retarding?
can you not have been retarding?
can she not have been retarding?
can we not have been retarding?
can you not have been retarding?
can they not have been retarding?