English verb conjugation
CAN RETARD

Regular verb: retard - retarded - retarded

Affirmation

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