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 could not downshift you could not downshift he could not downshift we could not downshift you could not downshift they could not downshift	I could not be downshifting you could not be downshifting he could not be downshifting we could not be downshifting you could not be downshifting they could not be downshifting
Perfect	V-ing perfect
I could not have downshifted you could not have downshifted he could not have downshifted we could not have downshifted you could not have downshifted they could not have downshifted	I could not have been downshifting you could not have been downshifting he could not have been downshifting we could not have been downshifting you could not have been downshifting they could not 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
could I not downshift? could you not downshift? could he not downshift? could we not downshift? could you not downshift? could they not downshift?	could I not be downshifting? could you not be downshifting? could he not be downshifting? could we not be downshifting? could you not be downshifting? could they not be downshifting?
Perfect	V-ing perfect
could I not have downshifted? could you not have downshifted? could he not have downshifted? could we not have downshifted? could you not have downshifted? could they not have downshifted?	could I not have been downshifting? could you not have been downshifting? could he not have been downshifting? could we not have been downshifting? could you not have been downshifting? could they not have been downshifting?