must detrain
Regular verb: detrain - detrained- detrained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must detrain
you must detrain
she must detrain
we must detrain
you must detrain
they must detrain 	I must be detraining
you must be detraining
she must be detraining
we must be detraining
you must be detraining
they must be detraining	I must have detrained
you must have detrained
she must have detrained
we must have detrained
you must have detrained
they must have detrained	I must have been detraining
you must have been detraining
she must have been detraining
we must have been detraining
you must have been detraining
they must have been detraining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not detrain
you must not detrain
she must not detrain
we must not detrain
you must not detrain
they must not detrain 	I must not be detraining
you must not be detraining
she must not be detraining
we must not be detraining
you must not be detraining
they must not be detraining	I must not have detrained
you must not have detrained
she must not have detrained
we must not have detrained
you must not have detrained
they must not have detrained	I must not have been detraining
you must not have been detraining
she must not have been detraining
we must not have been detraining
you must not have been detraining
they must not have been detraining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I detrain?
must you detrain?
must she detrain?
must we detrain?
must you detrain?
must they detrain? 	must I be detraining?
must you be detraining?
must she be detraining?
must we be detraining?
must you be detraining?
must they be detraining? 	must I have detrained?
must you have detrained?
must she have detrained?
must we have detrained?
must you have detrained?
must they have detrained? 	must I have been detraining?
must you have been detraining?
must she have been detraining?
must we have been detraining?
must you have been detraining?
must they have been detraining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not detrain?
must you not detrain?
must she not detrain?
must we not detrain?
must you not detrain?
must they not detrain? 	must I not be detraining?
must you not be detraining?
must she not be detraining?
must we not be detraining?
must you not be detraining?
must they not be detraining? 	must I not have detrained?
must you not have detrained?
must she not have detrained?
must we not have detrained?
must you not have detrained?
must they not have detrained? 	must I not have been detraining?
must you not have been detraining?
must she not have been detraining?
must we not have been detraining?
must you not have been detraining?
must they not have been detraining?