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 must not retrain you must not retrain he must not retrain we must not retrain you must not retrain they must not retrain	I must not be retraining you must not be retraining he must not be retraining we must not be retraining you must not be retraining they must not be retraining
Perfect	V-ing perfect
I must not have retrained you must not have retrained he must not have retrained we must not have retrained you must not have retrained they must not have retrained	I must not have been retraining you must not have been retraining he must not have been retraining we must not have been retraining you must not have been retraining they must not 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
must I not retrain? must you not retrain? must he not retrain? must we not retrain? must you not retrain? must they not retrain?	must I not be retraining? must you not be retraining? must he not be retraining? must we not be retraining? must you not be retraining? must they not be retraining?
Perfect	V-ing perfect
must I not have retrained? must you not have retrained? must he not have retrained? must we not have retrained? must you not have retrained? must they not have retrained?	must I not have been retraining? must you not have been retraining? must he not have been retraining? must we not have been retraining? must you not have been retraining? must they not have been retraining?