must refrain
Verbo regular: refrain - refrained- refrained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must refrain
you must refrain
he must refrain
we must refrain
you must refrain
they must refrain 	I must be refraining
you must be refraining
he must be refraining
we must be refraining
you must be refraining
they must be refraining	I must have refrained
you must have refrained
he must have refrained
we must have refrained
you must have refrained
they must have refrained	I must have been refraining
you must have been refraining
he must have been refraining
we must have been refraining
you must have been refraining
they must have been refraining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't refrain
you mustn't refrain
he mustn't refrain
we mustn't refrain
you mustn't refrain
they mustn't refrain 	I mustn't be refraining
you mustn't be refraining
he mustn't be refraining
we mustn't be refraining
you mustn't be refraining
they mustn't be refraining	I mustn't have refrained
you mustn't have refrained
he mustn't have refrained
we mustn't have refrained
you mustn't have refrained
they mustn't have refrained	I mustn't have been refraining
you mustn't have been refraining
he mustn't have been refraining
we mustn't have been refraining
you mustn't have been refraining
they mustn't have been refraining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I refrain?
must you refrain?
must he refrain?
must we refrain?
must you refrain?
must they refrain? 	must I be refraining?
must you be refraining?
must he be refraining?
must we be refraining?
must you be refraining?
must they be refraining? 	must I have refrained?
must you have refrained?
must he have refrained?
must we have refrained?
must you have refrained?
must they have refrained? 	must I have been refraining?
must you have been refraining?
must he have been refraining?
must we have been refraining?
must you have been refraining?
must they have been refraining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I refrain?
mustn't you refrain?
mustn't he refrain?
mustn't we refrain?
mustn't you refrain?
mustn't they refrain? 	mustn't I be refraining?
mustn't you be refraining?
mustn't he be refraining?
mustn't we be refraining?
mustn't you be refraining?
mustn't they be refraining? 	mustn't I have refrained?
mustn't you have refrained?
mustn't he have refrained?
mustn't we have refrained?
mustn't you have refrained?
mustn't they have refrained? 	mustn't I have been refraining?
mustn't you have been refraining?
mustn't he have been refraining?
mustn't we have been refraining?
mustn't you have been refraining?
mustn't they have been refraining?