English verb conjugation
COULD UNSHIFT

Regular verb: unshift - unshifted - unshifted

Affirmation

Simple form	V-ing form
I could unshift you could unshift he could unshift we could unshift you could unshift they could unshift	I could be unshifting you could be unshifting he could be unshifting we could be unshifting you could be unshifting they could be unshifting
Perfect	V-ing perfect
I could have unshifted you could have unshifted he could have unshifted we could have unshifted you could have unshifted they could have unshifted	I could have been unshifting you could have been unshifting he could have been unshifting we could have been unshifting you could have been unshifting they could have been unshifting

Negation

Simple form	V-ing form
I couldn't unshift you couldn't unshift he couldn't unshift we couldn't unshift you couldn't unshift they couldn't unshift	I couldn't be unshifting you couldn't be unshifting he couldn't be unshifting we couldn't be unshifting you couldn't be unshifting they couldn't be unshifting
Perfect	V-ing perfect
I couldn't have unshifted you couldn't have unshifted he couldn't have unshifted we couldn't have unshifted you couldn't have unshifted they couldn't have unshifted	I couldn't have been unshifting you couldn't have been unshifting he couldn't have been unshifting we couldn't have been unshifting you couldn't have been unshifting they couldn't have been unshifting

Interrogative form

Simple form	V-ing form
could I unshift? could you unshift? could he unshift? could we unshift? could you unshift? could they unshift?	could I be unshifting? could you be unshifting? could he be unshifting? could we be unshifting? could you be unshifting? could they be unshifting?
Perfect	V-ing perfect
could I have unshifted? could you have unshifted? could he have unshifted? could we have unshifted? could you have unshifted? could they have unshifted?	could I have been unshifting? could you have been unshifting? could he have been unshifting? could we have been unshifting? could you have been unshifting? could they have been unshifting?

Interro-negative form

Simple form	V-ing form
couldn't I unshift? couldn't you unshift? couldn't he unshift? couldn't we unshift? couldn't you unshift? couldn't they unshift?	couldn't I be unshifting? couldn't you be unshifting? couldn't he be unshifting? couldn't we be unshifting? couldn't you be unshifting? couldn't they be unshifting?
Perfect	V-ing perfect
couldn't I have unshifted? couldn't you have unshifted? couldn't he have unshifted? couldn't we have unshifted? couldn't you have unshifted? couldn't they have unshifted?	couldn't I have been unshifting? couldn't you have been unshifting? couldn't he have been unshifting? couldn't we have been unshifting? couldn't you have been unshifting? couldn't they have been unshifting?