must calk
Verbo regular: calk - calked- calked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must calk
you must calk
he must calk
we must calk
you must calk
they must calk 	I must be calking
you must be calking
he must be calking
we must be calking
you must be calking
they must be calking	I must have calked
you must have calked
he must have calked
we must have calked
you must have calked
they must have calked	I must have been calking
you must have been calking
he must have been calking
we must have been calking
you must have been calking
they must have been calking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't calk
you mustn't calk
he mustn't calk
we mustn't calk
you mustn't calk
they mustn't calk 	I mustn't be calking
you mustn't be calking
he mustn't be calking
we mustn't be calking
you mustn't be calking
they mustn't be calking	I mustn't have calked
you mustn't have calked
he mustn't have calked
we mustn't have calked
you mustn't have calked
they mustn't have calked	I mustn't have been calking
you mustn't have been calking
he mustn't have been calking
we mustn't have been calking
you mustn't have been calking
they mustn't have been calking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I calk?
must you calk?
must he calk?
must we calk?
must you calk?
must they calk? 	must I be calking?
must you be calking?
must he be calking?
must we be calking?
must you be calking?
must they be calking? 	must I have calked?
must you have calked?
must he have calked?
must we have calked?
must you have calked?
must they have calked? 	must I have been calking?
must you have been calking?
must he have been calking?
must we have been calking?
must you have been calking?
must they have been calking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I calk?
mustn't you calk?
mustn't he calk?
mustn't we calk?
mustn't you calk?
mustn't they calk? 	mustn't I be calking?
mustn't you be calking?
mustn't he be calking?
mustn't we be calking?
mustn't you be calking?
mustn't they be calking? 	mustn't I have calked?
mustn't you have calked?
mustn't he have calked?
mustn't we have calked?
mustn't you have calked?
mustn't they have calked? 	mustn't I have been calking?
mustn't you have been calking?
mustn't he have been calking?
mustn't we have been calking?
mustn't you have been calking?
mustn't they have been calking?