must entrain
Regular verb: entrain - entrained- entrained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must entrain
you must entrain
he must entrain
we must entrain
you must entrain
they must entrain 	I must be entraining
you must be entraining
he must be entraining
we must be entraining
you must be entraining
they must be entraining	I must have entrained
you must have entrained
he must have entrained
we must have entrained
you must have entrained
they must have entrained	I must have been entraining
you must have been entraining
he must have been entraining
we must have been entraining
you must have been entraining
they must have been entraining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't entrain
you mustn't entrain
he mustn't entrain
we mustn't entrain
you mustn't entrain
they mustn't entrain 	I mustn't be entraining
you mustn't be entraining
he mustn't be entraining
we mustn't be entraining
you mustn't be entraining
they mustn't be entraining	I mustn't have entrained
you mustn't have entrained
he mustn't have entrained
we mustn't have entrained
you mustn't have entrained
they mustn't have entrained	I mustn't have been entraining
you mustn't have been entraining
he mustn't have been entraining
we mustn't have been entraining
you mustn't have been entraining
they mustn't have been entraining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I entrain?
must you entrain?
must he entrain?
must we entrain?
must you entrain?
must they entrain? 	must I be entraining?
must you be entraining?
must he be entraining?
must we be entraining?
must you be entraining?
must they be entraining? 	must I have entrained?
must you have entrained?
must he have entrained?
must we have entrained?
must you have entrained?
must they have entrained? 	must I have been entraining?
must you have been entraining?
must he have been entraining?
must we have been entraining?
must you have been entraining?
must they have been entraining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I entrain?
mustn't you entrain?
mustn't he entrain?
mustn't we entrain?
mustn't you entrain?
mustn't they entrain? 	mustn't I be entraining?
mustn't you be entraining?
mustn't he be entraining?
mustn't we be entraining?
mustn't you be entraining?
mustn't they be entraining? 	mustn't I have entrained?
mustn't you have entrained?
mustn't he have entrained?
mustn't we have entrained?
mustn't you have entrained?
mustn't they have entrained? 	mustn't I have been entraining?
mustn't you have been entraining?
mustn't he have been entraining?
mustn't we have been entraining?
mustn't you have been entraining?
mustn't they have been entraining?