should retard
Verbo regular: retard - retarded- retarded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should retard
you should retard
he should retard
we should retard
you should retard
they should retard 	I should be retarding
you should be retarding
he should be retarding
we should be retarding
you should be retarding
they should be retarding	I should have retarded
you should have retarded
he should have retarded
we should have retarded
you should have retarded
they should have retarded	I should have been retarding
you should have been retarding
he should have been retarding
we should have been retarding
you should have been retarding
they should have been retarding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should not retard
you should not retard
he should not retard
we should not retard
you should not retard
they should not retard 	I should not be retarding
you should not be retarding
he should not be retarding
we should not be retarding
you should not be retarding
they should not be retarding	I should not have retarded
you should not have retarded
he should not have retarded
we should not have retarded
you should not have retarded
they should not have retarded	I should not have been retarding
you should not have been retarding
he should not have been retarding
we should not have been retarding
you should not have been retarding
they should not have been retarding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I retard?
should you retard?
should he retard?
should we retard?
should you retard?
should they retard? 	should I be retarding?
should you be retarding?
should he be retarding?
should we be retarding?
should you be retarding?
should they be retarding? 	should I have retarded?
should you have retarded?
should he have retarded?
should we have retarded?
should you have retarded?
should they have retarded? 	should I have been retarding?
should you have been retarding?
should he have been retarding?
should we have been retarding?
should you have been retarding?
should they have been retarding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I not retard?
should you not retard?
should he not retard?
should we not retard?
should you not retard?
should they not retard? 	should I not be retarding?
should you not be retarding?
should he not be retarding?
should we not be retarding?
should you not be retarding?
should they not be retarding? 	should I not have retarded?
should you not have retarded?
should he not have retarded?
should we not have retarded?
should you not have retarded?
should they not have retarded? 	should I not have been retarding?
should you not have been retarding?
should he not have been retarding?
should we not have been retarding?
should you not have been retarding?
should they not have been retarding?