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
she must refrain
we must refrain
you must refrain
they must refrain 	I must be refraining
you must be refraining
she must be refraining
we must be refraining
you must be refraining
they must be refraining	I must have refrained
you must have refrained
she 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
she 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 must not refrain
you must not refrain
she must not refrain
we must not refrain
you must not refrain
they must not refrain 	I must not be refraining
you must not be refraining
she must not be refraining
we must not be refraining
you must not be refraining
they must not be refraining	I must not have refrained
you must not have refrained
she must not have refrained
we must not have refrained
you must not have refrained
they must not have refrained	I must not have been refraining
you must not have been refraining
she must not have been refraining
we must not have been refraining
you must not have been refraining
they must not have been refraining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I refrain?
must you refrain?
must she refrain?
must we refrain?
must you refrain?
must they refrain? 	must I be refraining?
must you be refraining?
must she be refraining?
must we be refraining?
must you be refraining?
must they be refraining? 	must I have refrained?
must you have refrained?
must she 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 she 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 	
must I not refrain?
must you not refrain?
must she not refrain?
must we not refrain?
must you not refrain?
must they not refrain? 	must I not be refraining?
must you not be refraining?
must she not be refraining?
must we not be refraining?
must you not be refraining?
must they not be refraining? 	must I not have refrained?
must you not have refrained?
must she not have refrained?
must we not have refrained?
must you not have refrained?
must they not have refrained? 	must I not have been refraining?
must you not have been refraining?
must she not have been refraining?
must we not have been refraining?
must you not have been refraining?
must they not have been refraining?