English verb conjugation
COULD UPHOLD

Irregular verb: uphold - upheld - upheld

Affirmation

Simple form	V-ing form
I could uphold you could uphold he could uphold we could uphold you could uphold they could uphold	I could be upholding you could be upholding he could be upholding we could be upholding you could be upholding they could be upholding
Perfect	V-ing perfect
I could have upheld you could have upheld he could have upheld we could have upheld you could have upheld they could have upheld	I could have been upholding you could have been upholding he could have been upholding we could have been upholding you could have been upholding they could have been upholding

Negation

Simple form	V-ing form
I couldn't uphold you couldn't uphold he couldn't uphold we couldn't uphold you couldn't uphold they couldn't uphold	I couldn't be upholding you couldn't be upholding he couldn't be upholding we couldn't be upholding you couldn't be upholding they couldn't be upholding
Perfect	V-ing perfect
I couldn't have upheld you couldn't have upheld he couldn't have upheld we couldn't have upheld you couldn't have upheld they couldn't have upheld	I couldn't have been upholding you couldn't have been upholding he couldn't have been upholding we couldn't have been upholding you couldn't have been upholding they couldn't have been upholding

Interrogative form

Simple form	V-ing form
could I uphold? could you uphold? could he uphold? could we uphold? could you uphold? could they uphold?	could I be upholding? could you be upholding? could he be upholding? could we be upholding? could you be upholding? could they be upholding?
Perfect	V-ing perfect
could I have upheld? could you have upheld? could he have upheld? could we have upheld? could you have upheld? could they have upheld?	could I have been upholding? could you have been upholding? could he have been upholding? could we have been upholding? could you have been upholding? could they have been upholding?

Interro-negative form

Simple form	V-ing form
couldn't I uphold? couldn't you uphold? couldn't he uphold? couldn't we uphold? couldn't you uphold? couldn't they uphold?	couldn't I be upholding? couldn't you be upholding? couldn't he be upholding? couldn't we be upholding? couldn't you be upholding? couldn't they be upholding?
Perfect	V-ing perfect
couldn't I have upheld? couldn't you have upheld? couldn't he have upheld? couldn't we have upheld? couldn't you have upheld? couldn't they have upheld?	couldn't I have been upholding? couldn't you have been upholding? couldn't he have been upholding? couldn't we have been upholding? couldn't you have been upholding? couldn't they have been upholding?