must uphold
Verbo irregular: uphold - upheld- upheld

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must uphold
you must uphold
he must uphold
we must uphold
you must uphold
they must uphold 	I must be upholding
you must be upholding
he must be upholding
we must be upholding
you must be upholding
they must be upholding	I must have upheld
you must have upheld
he must have upheld
we must have upheld
you must have upheld
they must have upheld	I must have been upholding
you must have been upholding
he must have been upholding
we must have been upholding
you must have been upholding
they must have been upholding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't uphold
you mustn't uphold
he mustn't uphold
we mustn't uphold
you mustn't uphold
they mustn't uphold 	I mustn't be upholding
you mustn't be upholding
he mustn't be upholding
we mustn't be upholding
you mustn't be upholding
they mustn't be upholding	I mustn't have upheld
you mustn't have upheld
he mustn't have upheld
we mustn't have upheld
you mustn't have upheld
they mustn't have upheld	I mustn't have been upholding
you mustn't have been upholding
he mustn't have been upholding
we mustn't have been upholding
you mustn't have been upholding
they mustn't have been upholding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I uphold?
must you uphold?
must he uphold?
must we uphold?
must you uphold?
must they uphold? 	must I be upholding?
must you be upholding?
must he be upholding?
must we be upholding?
must you be upholding?
must they be upholding? 	must I have upheld?
must you have upheld?
must he have upheld?
must we have upheld?
must you have upheld?
must they have upheld? 	must I have been upholding?
must you have been upholding?
must he have been upholding?
must we have been upholding?
must you have been upholding?
must they have been upholding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I uphold?
mustn't you uphold?
mustn't he uphold?
mustn't we uphold?
mustn't you uphold?
mustn't they uphold? 	mustn't I be upholding?
mustn't you be upholding?
mustn't he be upholding?
mustn't we be upholding?
mustn't you be upholding?
mustn't they be upholding? 	mustn't I have upheld?
mustn't you have upheld?
mustn't he have upheld?
mustn't we have upheld?
mustn't you have upheld?
mustn't they have upheld? 	mustn't I have been upholding?
mustn't you have been upholding?
mustn't he have been upholding?
mustn't we have been upholding?
mustn't you have been upholding?
mustn't they have been upholding?