English verb conjugation
CAN RETRAIN

Regular verb: retrain - retrained - retrained

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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