English verb conjugation
COULD UPWELL

Regular verb: upwell - upwelled - upwelled

Affirmation

Simple form	V-ing form
I could upwell you could upwell he could upwell we could upwell you could upwell they could upwell	I could be upwelling you could be upwelling he could be upwelling we could be upwelling you could be upwelling they could be upwelling
Perfect	V-ing perfect
I could have upwelled you could have upwelled he could have upwelled we could have upwelled you could have upwelled they could have upwelled	I could have been upwelling you could have been upwelling he could have been upwelling we could have been upwelling you could have been upwelling they could have been upwelling

Negation

Simple form	V-ing form
I couldn't upwell you couldn't upwell he couldn't upwell we couldn't upwell you couldn't upwell they couldn't upwell	I couldn't be upwelling you couldn't be upwelling he couldn't be upwelling we couldn't be upwelling you couldn't be upwelling they couldn't be upwelling
Perfect	V-ing perfect
I couldn't have upwelled you couldn't have upwelled he couldn't have upwelled we couldn't have upwelled you couldn't have upwelled they couldn't have upwelled	I couldn't have been upwelling you couldn't have been upwelling he couldn't have been upwelling we couldn't have been upwelling you couldn't have been upwelling they couldn't have been upwelling

Interrogative form

Simple form	V-ing form
could I upwell? could you upwell? could he upwell? could we upwell? could you upwell? could they upwell?	could I be upwelling? could you be upwelling? could he be upwelling? could we be upwelling? could you be upwelling? could they be upwelling?
Perfect	V-ing perfect
could I have upwelled? could you have upwelled? could he have upwelled? could we have upwelled? could you have upwelled? could they have upwelled?	could I have been upwelling? could you have been upwelling? could he have been upwelling? could we have been upwelling? could you have been upwelling? could they have been upwelling?

Interro-negative form

Simple form	V-ing form
couldn't I upwell? couldn't you upwell? couldn't he upwell? couldn't we upwell? couldn't you upwell? couldn't they upwell?	couldn't I be upwelling? couldn't you be upwelling? couldn't he be upwelling? couldn't we be upwelling? couldn't you be upwelling? couldn't they be upwelling?
Perfect	V-ing perfect
couldn't I have upwelled? couldn't you have upwelled? couldn't he have upwelled? couldn't we have upwelled? couldn't you have upwelled? couldn't they have upwelled?	couldn't I have been upwelling? couldn't you have been upwelling? couldn't he have been upwelling? couldn't we have been upwelling? couldn't you have been upwelling? couldn't they have been upwelling?