English verb conjugation
MUST RETARD

Regular verb: retard - retarded - retarded

Affirmation

Simple form	V-ing form
I must retard you must retard he must retard we must retard you must retard they must retard	I must be retarding you must be retarding he must be retarding we must be retarding you must be retarding they must be retarding
Perfect	V-ing perfect
I must have retarded you must have retarded he must have retarded we must have retarded you must have retarded they must have retarded	I must have been retarding you must have been retarding he must have been retarding we must have been retarding you must have been retarding they must have been retarding

Negation

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

Interrogative form

Simple form	V-ing form
must I retard? must you retard? must he retard? must we retard? must you retard? must they retard?	must I be retarding? must you be retarding? must he be retarding? must we be retarding? must you be retarding? must they be retarding?
Perfect	V-ing perfect
must I have retarded? must you have retarded? must he have retarded? must we have retarded? must you have retarded? must they have retarded?	must I have been retarding? must you have been retarding? must he have been retarding? must we have been retarding? must you have been retarding? must they have been retarding?

Interro-negative form

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