must down
Verbo regular: down - downed- downed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must down
you must down
she must down
we must down
you must down
they must down 	I must be downing
you must be downing
she must be downing
we must be downing
you must be downing
they must be downing	I must have downed
you must have downed
she must have downed
we must have downed
you must have downed
they must have downed	I must have been downing
you must have been downing
she must have been downing
we must have been downing
you must have been downing
they must have been downing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't down
you mustn't down
she mustn't down
we mustn't down
you mustn't down
they mustn't down 	I mustn't be downing
you mustn't be downing
she mustn't be downing
we mustn't be downing
you mustn't be downing
they mustn't be downing	I mustn't have downed
you mustn't have downed
she mustn't have downed
we mustn't have downed
you mustn't have downed
they mustn't have downed	I mustn't have been downing
you mustn't have been downing
she mustn't have been downing
we mustn't have been downing
you mustn't have been downing
they mustn't have been downing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I down?
must you down?
must she down?
must we down?
must you down?
must they down? 	must I be downing?
must you be downing?
must she be downing?
must we be downing?
must you be downing?
must they be downing? 	must I have downed?
must you have downed?
must she have downed?
must we have downed?
must you have downed?
must they have downed? 	must I have been downing?
must you have been downing?
must she have been downing?
must we have been downing?
must you have been downing?
must they have been downing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I down?
mustn't you down?
mustn't she down?
mustn't we down?
mustn't you down?
mustn't they down? 	mustn't I be downing?
mustn't you be downing?
mustn't she be downing?
mustn't we be downing?
mustn't you be downing?
mustn't they be downing? 	mustn't I have downed?
mustn't you have downed?
mustn't she have downed?
mustn't we have downed?
mustn't you have downed?
mustn't they have downed? 	mustn't I have been downing?
mustn't you have been downing?
mustn't she have been downing?
mustn't we have been downing?
mustn't you have been downing?
mustn't they have been downing?