English verb conjugation
MUST RETRAIN

Regular verb: retrain - retrained - retrained

Affirmation

Simple form	V-ing form
I must retrain you must retrain he must retrain we must retrain you must retrain they must retrain	I must be retraining you must be retraining he must be retraining we must be retraining you must be retraining they must be retraining
Perfect	V-ing perfect
I must have retrained you must have retrained he must have retrained we must have retrained you must have retrained they must have retrained	I must have been retraining you must have been retraining he must have been retraining we must have been retraining you must have been retraining they must have been retraining

Negation

Simple form	V-ing form
I mustn't retrain you mustn't retrain he mustn't retrain we mustn't retrain you mustn't retrain they mustn't retrain	I mustn't be retraining you mustn't be retraining he mustn't be retraining we mustn't be retraining you mustn't be retraining they mustn't be retraining
Perfect	V-ing perfect
I mustn't have retrained you mustn't have retrained he mustn't have retrained we mustn't have retrained you mustn't have retrained they mustn't have retrained	I mustn't have been retraining you mustn't have been retraining he mustn't have been retraining we mustn't have been retraining you mustn't have been retraining they mustn't have been retraining

Interrogative form

Simple form	V-ing form
must I retrain? must you retrain? must he retrain? must we retrain? must you retrain? must they retrain?	must I be retraining? must you be retraining? must he be retraining? must we be retraining? must you be retraining? must they be retraining?
Perfect	V-ing perfect
must I have retrained? must you have retrained? must he have retrained? must we have retrained? must you have retrained? must they have retrained?	must I have been retraining? must you have been retraining? must he have been retraining? must we have been retraining? must you have been retraining? must they have been retraining?

Interro-negative form

Simple form	V-ing form
mustn't I retrain? mustn't you retrain? mustn't he retrain? mustn't we retrain? mustn't you retrain? mustn't they retrain?	mustn't I be retraining? mustn't you be retraining? mustn't he be retraining? mustn't we be retraining? mustn't you be retraining? mustn't they be retraining?
Perfect	V-ing perfect
mustn't I have retrained? mustn't you have retrained? mustn't he have retrained? mustn't we have retrained? mustn't you have retrained? mustn't they have retrained?	mustn't I have been retraining? mustn't you have been retraining? mustn't he have been retraining? mustn't we have been retraining? mustn't you have been retraining? mustn't they have been retraining?