English verb conjugation
MUST UPHOLD

Irregular verb: uphold - upheld - upheld

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?