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