must act
Verbo regular: act - acted- acted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must act
you must act
he must act
we must act
you must act
they must act 	I must be acting
you must be acting
he must be acting
we must be acting
you must be acting
they must be acting	I must have acted
you must have acted
he must have acted
we must have acted
you must have acted
they must have acted	I must have been acting
you must have been acting
he must have been acting
we must have been acting
you must have been acting
they must have been acting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't act
you mustn't act
he mustn't act
we mustn't act
you mustn't act
they mustn't act 	I mustn't be acting
you mustn't be acting
he mustn't be acting
we mustn't be acting
you mustn't be acting
they mustn't be acting	I mustn't have acted
you mustn't have acted
he mustn't have acted
we mustn't have acted
you mustn't have acted
they mustn't have acted	I mustn't have been acting
you mustn't have been acting
he mustn't have been acting
we mustn't have been acting
you mustn't have been acting
they mustn't have been acting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I act?
must you act?
must he act?
must we act?
must you act?
must they act? 	must I be acting?
must you be acting?
must he be acting?
must we be acting?
must you be acting?
must they be acting? 	must I have acted?
must you have acted?
must he have acted?
must we have acted?
must you have acted?
must they have acted? 	must I have been acting?
must you have been acting?
must he have been acting?
must we have been acting?
must you have been acting?
must they have been acting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I act?
mustn't you act?
mustn't he act?
mustn't we act?
mustn't you act?
mustn't they act? 	mustn't I be acting?
mustn't you be acting?
mustn't he be acting?
mustn't we be acting?
mustn't you be acting?
mustn't they be acting? 	mustn't I have acted?
mustn't you have acted?
mustn't he have acted?
mustn't we have acted?
mustn't you have acted?
mustn't they have acted? 	mustn't I have been acting?
mustn't you have been acting?
mustn't he have been acting?
mustn't we have been acting?
mustn't you have been acting?
mustn't they have been acting?