English verb conjugation
COULD UPSHIFT

Regular verb: upshift - upshifted - upshifted

Affirmation

Simple form	V-ing form
I could upshift you could upshift he could upshift we could upshift you could upshift they could upshift	I could be upshifting you could be upshifting he could be upshifting we could be upshifting you could be upshifting they could be upshifting
Perfect	V-ing perfect
I could have upshifted you could have upshifted he could have upshifted we could have upshifted you could have upshifted they could have upshifted	I could have been upshifting you could have been upshifting he could have been upshifting we could have been upshifting you could have been upshifting they could have been upshifting

Negation

Simple form	V-ing form
I couldn't upshift you couldn't upshift he couldn't upshift we couldn't upshift you couldn't upshift they couldn't upshift	I couldn't be upshifting you couldn't be upshifting he couldn't be upshifting we couldn't be upshifting you couldn't be upshifting they couldn't be upshifting
Perfect	V-ing perfect
I couldn't have upshifted you couldn't have upshifted he couldn't have upshifted we couldn't have upshifted you couldn't have upshifted they couldn't have upshifted	I couldn't have been upshifting you couldn't have been upshifting he couldn't have been upshifting we couldn't have been upshifting you couldn't have been upshifting they couldn't have been upshifting

Interrogative form

Simple form	V-ing form
could I upshift? could you upshift? could he upshift? could we upshift? could you upshift? could they upshift?	could I be upshifting? could you be upshifting? could he be upshifting? could we be upshifting? could you be upshifting? could they be upshifting?
Perfect	V-ing perfect
could I have upshifted? could you have upshifted? could he have upshifted? could we have upshifted? could you have upshifted? could they have upshifted?	could I have been upshifting? could you have been upshifting? could he have been upshifting? could we have been upshifting? could you have been upshifting? could they have been upshifting?

Interro-negative form

Simple form	V-ing form
couldn't I upshift? couldn't you upshift? couldn't he upshift? couldn't we upshift? couldn't you upshift? couldn't they upshift?	couldn't I be upshifting? couldn't you be upshifting? couldn't he be upshifting? couldn't we be upshifting? couldn't you be upshifting? couldn't they be upshifting?
Perfect	V-ing perfect
couldn't I have upshifted? couldn't you have upshifted? couldn't he have upshifted? couldn't we have upshifted? couldn't you have upshifted? couldn't they have upshifted?	couldn't I have been upshifting? couldn't you have been upshifting? couldn't he have been upshifting? couldn't we have been upshifting? couldn't you have been upshifting? couldn't they have been upshifting?