must engrain
Verbo regular: engrain - engrained- engrained

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must engrain
you must engrain
he must engrain
we must engrain
you must engrain
they must engrain 	I must be engraining
you must be engraining
he must be engraining
we must be engraining
you must be engraining
they must be engraining	I must have engrained
you must have engrained
he must have engrained
we must have engrained
you must have engrained
they must have engrained	I must have been engraining
you must have been engraining
he must have been engraining
we must have been engraining
you must have been engraining
they must have been engraining	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't engrain
you mustn't engrain
he mustn't engrain
we mustn't engrain
you mustn't engrain
they mustn't engrain 	I mustn't be engraining
you mustn't be engraining
he mustn't be engraining
we mustn't be engraining
you mustn't be engraining
they mustn't be engraining	I mustn't have engrained
you mustn't have engrained
he mustn't have engrained
we mustn't have engrained
you mustn't have engrained
they mustn't have engrained	I mustn't have been engraining
you mustn't have been engraining
he mustn't have been engraining
we mustn't have been engraining
you mustn't have been engraining
they mustn't have been engraining	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I engrain?
must you engrain?
must he engrain?
must we engrain?
must you engrain?
must they engrain? 	must I be engraining?
must you be engraining?
must he be engraining?
must we be engraining?
must you be engraining?
must they be engraining? 	must I have engrained?
must you have engrained?
must he have engrained?
must we have engrained?
must you have engrained?
must they have engrained? 	must I have been engraining?
must you have been engraining?
must he have been engraining?
must we have been engraining?
must you have been engraining?
must they have been engraining? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I engrain?
mustn't you engrain?
mustn't he engrain?
mustn't we engrain?
mustn't you engrain?
mustn't they engrain? 	mustn't I be engraining?
mustn't you be engraining?
mustn't he be engraining?
mustn't we be engraining?
mustn't you be engraining?
mustn't they be engraining? 	mustn't I have engrained?
mustn't you have engrained?
mustn't he have engrained?
mustn't we have engrained?
mustn't you have engrained?
mustn't they have engrained? 	mustn't I have been engraining?
mustn't you have been engraining?
mustn't he have been engraining?
mustn't we have been engraining?
mustn't you have been engraining?
mustn't they have been engraining?