must calculate
Verbo regular: calculate - calculated- calculated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must calculate
you must calculate
he must calculate
we must calculate
you must calculate
they must calculate 	I must be calculating
you must be calculating
he must be calculating
we must be calculating
you must be calculating
they must be calculating	I must have calculated
you must have calculated
he must have calculated
we must have calculated
you must have calculated
they must have calculated	I must have been calculating
you must have been calculating
he must have been calculating
we must have been calculating
you must have been calculating
they must have been calculating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't calculate
you mustn't calculate
he mustn't calculate
we mustn't calculate
you mustn't calculate
they mustn't calculate 	I mustn't be calculating
you mustn't be calculating
he mustn't be calculating
we mustn't be calculating
you mustn't be calculating
they mustn't be calculating	I mustn't have calculated
you mustn't have calculated
he mustn't have calculated
we mustn't have calculated
you mustn't have calculated
they mustn't have calculated	I mustn't have been calculating
you mustn't have been calculating
he mustn't have been calculating
we mustn't have been calculating
you mustn't have been calculating
they mustn't have been calculating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I calculate?
must you calculate?
must he calculate?
must we calculate?
must you calculate?
must they calculate? 	must I be calculating?
must you be calculating?
must he be calculating?
must we be calculating?
must you be calculating?
must they be calculating? 	must I have calculated?
must you have calculated?
must he have calculated?
must we have calculated?
must you have calculated?
must they have calculated? 	must I have been calculating?
must you have been calculating?
must he have been calculating?
must we have been calculating?
must you have been calculating?
must they have been calculating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I calculate?
mustn't you calculate?
mustn't he calculate?
mustn't we calculate?
mustn't you calculate?
mustn't they calculate? 	mustn't I be calculating?
mustn't you be calculating?
mustn't he be calculating?
mustn't we be calculating?
mustn't you be calculating?
mustn't they be calculating? 	mustn't I have calculated?
mustn't you have calculated?
mustn't he have calculated?
mustn't we have calculated?
mustn't you have calculated?
mustn't they have calculated? 	mustn't I have been calculating?
mustn't you have been calculating?
mustn't he have been calculating?
mustn't we have been calculating?
mustn't you have been calculating?
mustn't they have been calculating?