must exercise
Verbo regular: exercise - exercised- exercised

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must exercise
you must exercise
he must exercise
we must exercise
you must exercise
they must exercise 	I must be exercising
you must be exercising
he must be exercising
we must be exercising
you must be exercising
they must be exercising	I must have exercised
you must have exercised
he must have exercised
we must have exercised
you must have exercised
they must have exercised	I must have been exercising
you must have been exercising
he must have been exercising
we must have been exercising
you must have been exercising
they must have been exercising	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't exercise
you mustn't exercise
he mustn't exercise
we mustn't exercise
you mustn't exercise
they mustn't exercise 	I mustn't be exercising
you mustn't be exercising
he mustn't be exercising
we mustn't be exercising
you mustn't be exercising
they mustn't be exercising	I mustn't have exercised
you mustn't have exercised
he mustn't have exercised
we mustn't have exercised
you mustn't have exercised
they mustn't have exercised	I mustn't have been exercising
you mustn't have been exercising
he mustn't have been exercising
we mustn't have been exercising
you mustn't have been exercising
they mustn't have been exercising	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I exercise?
must you exercise?
must he exercise?
must we exercise?
must you exercise?
must they exercise? 	must I be exercising?
must you be exercising?
must he be exercising?
must we be exercising?
must you be exercising?
must they be exercising? 	must I have exercised?
must you have exercised?
must he have exercised?
must we have exercised?
must you have exercised?
must they have exercised? 	must I have been exercising?
must you have been exercising?
must he have been exercising?
must we have been exercising?
must you have been exercising?
must they have been exercising? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I exercise?
mustn't you exercise?
mustn't he exercise?
mustn't we exercise?
mustn't you exercise?
mustn't they exercise? 	mustn't I be exercising?
mustn't you be exercising?
mustn't he be exercising?
mustn't we be exercising?
mustn't you be exercising?
mustn't they be exercising? 	mustn't I have exercised?
mustn't you have exercised?
mustn't he have exercised?
mustn't we have exercised?
mustn't you have exercised?
mustn't they have exercised? 	mustn't I have been exercising?
mustn't you have been exercising?
mustn't he have been exercising?
mustn't we have been exercising?
mustn't you have been exercising?
mustn't they have been exercising?