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 could not unshift you could not unshift he could not unshift we could not unshift you could not unshift they could not unshift	I could not be unshifting you could not be unshifting he could not be unshifting we could not be unshifting you could not be unshifting they could not be unshifting
Perfect	V-ing perfect
I could not have unshifted you could not have unshifted he could not have unshifted we could not have unshifted you could not have unshifted they could not have unshifted	I could not have been unshifting you could not have been unshifting he could not have been unshifting we could not have been unshifting you could not have been unshifting they could not 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
could I not unshift? could you not unshift? could he not unshift? could we not unshift? could you not unshift? could they not unshift?	could I not be unshifting? could you not be unshifting? could he not be unshifting? could we not be unshifting? could you not be unshifting? could they not be unshifting?
Perfect	V-ing perfect
could I not have unshifted? could you not have unshifted? could he not have unshifted? could we not have unshifted? could you not have unshifted? could they not have unshifted?	could I not have been unshifting? could you not have been unshifting? could he not have been unshifting? could we not have been unshifting? could you not have been unshifting? could they not have been unshifting?