English verb conjugation
COULD DOWNSHIFT

Regular verb: downshift - downshifted - downshifted

Affirmation

Simple form	V-ing form
I could downshift you could downshift he could downshift we could downshift you could downshift they could downshift	I could be downshifting you could be downshifting he could be downshifting we could be downshifting you could be downshifting they could be downshifting
Perfect	V-ing perfect
I could have downshifted you could have downshifted he could have downshifted we could have downshifted you could have downshifted they could have downshifted	I could have been downshifting you could have been downshifting he could have been downshifting we could have been downshifting you could have been downshifting they could have been downshifting

Negation

Simple form	V-ing form
I couldn't downshift you couldn't downshift he couldn't downshift we couldn't downshift you couldn't downshift they couldn't downshift	I couldn't be downshifting you couldn't be downshifting he couldn't be downshifting we couldn't be downshifting you couldn't be downshifting they couldn't be downshifting
Perfect	V-ing perfect
I couldn't have downshifted you couldn't have downshifted he couldn't have downshifted we couldn't have downshifted you couldn't have downshifted they couldn't have downshifted	I couldn't have been downshifting you couldn't have been downshifting he couldn't have been downshifting we couldn't have been downshifting you couldn't have been downshifting they couldn't have been downshifting

Interrogative form

Simple form	V-ing form
could I downshift? could you downshift? could he downshift? could we downshift? could you downshift? could they downshift?	could I be downshifting? could you be downshifting? could he be downshifting? could we be downshifting? could you be downshifting? could they be downshifting?
Perfect	V-ing perfect
could I have downshifted? could you have downshifted? could he have downshifted? could we have downshifted? could you have downshifted? could they have downshifted?	could I have been downshifting? could you have been downshifting? could he have been downshifting? could we have been downshifting? could you have been downshifting? could they have been downshifting?

Interro-negative form

Simple form	V-ing form
couldn't I downshift? couldn't you downshift? couldn't he downshift? couldn't we downshift? couldn't you downshift? couldn't they downshift?	couldn't I be downshifting? couldn't you be downshifting? couldn't he be downshifting? couldn't we be downshifting? couldn't you be downshifting? couldn't they be downshifting?
Perfect	V-ing perfect
couldn't I have downshifted? couldn't you have downshifted? couldn't he have downshifted? couldn't we have downshifted? couldn't you have downshifted? couldn't they have downshifted?	couldn't I have been downshifting? couldn't you have been downshifting? couldn't he have been downshifting? couldn't we have been downshifting? couldn't you have been downshifting? couldn't they have been downshifting?