English verb conjugation
COULD DOWNSHIFT

Regular verb: downshift - downshifted - downshifted

Affirmation

Simple form	V-ing form
I could downshift you could downshift she could downshift we could downshift you could downshift they could downshift	I could be downshifting you could be downshifting she 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 she 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 she 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 she 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 she 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 she 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 she 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 she downshift? could we downshift? could you downshift? could they downshift?	could I be downshifting? could you be downshifting? could she 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 she 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 she 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 she 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 she 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 she 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 she have been downshifting? couldn't we have been downshifting? couldn't you have been downshifting? couldn't they have been downshifting?