English verb conjugation
COULD UNZIP

Regular verb: unzip - unziped - unziped

Affirmation

Simple form	V-ing form
I could unzip you could unzip he could unzip we could unzip you could unzip they could unzip	I could be unziping you could be unziping he could be unziping we could be unziping you could be unziping they could be unziping
Perfect	V-ing perfect
I could have unziped you could have unziped he could have unziped we could have unziped you could have unziped they could have unziped	I could have been unziping you could have been unziping he could have been unziping we could have been unziping you could have been unziping they could have been unziping

Negation

Simple form	V-ing form
I could not unzip you could not unzip he could not unzip we could not unzip you could not unzip they could not unzip	I could not be unziping you could not be unziping he could not be unziping we could not be unziping you could not be unziping they could not be unziping
Perfect	V-ing perfect
I could not have unziped you could not have unziped he could not have unziped we could not have unziped you could not have unziped they could not have unziped	I could not have been unziping you could not have been unziping he could not have been unziping we could not have been unziping you could not have been unziping they could not have been unziping

Interrogative form

Simple form	V-ing form
could I unzip? could you unzip? could he unzip? could we unzip? could you unzip? could they unzip?	could I be unziping? could you be unziping? could he be unziping? could we be unziping? could you be unziping? could they be unziping?
Perfect	V-ing perfect
could I have unziped? could you have unziped? could he have unziped? could we have unziped? could you have unziped? could they have unziped?	could I have been unziping? could you have been unziping? could he have been unziping? could we have been unziping? could you have been unziping? could they have been unziping?

Interro-negative form

Simple form	V-ing form
could I not unzip? could you not unzip? could he not unzip? could we not unzip? could you not unzip? could they not unzip?	could I not be unziping? could you not be unziping? could he not be unziping? could we not be unziping? could you not be unziping? could they not be unziping?
Perfect	V-ing perfect
could I not have unziped? could you not have unziped? could he not have unziped? could we not have unziped? could you not have unziped? could they not have unziped?	could I not have been unziping? could you not have been unziping? could he not have been unziping? could we not have been unziping? could you not have been unziping? could they not have been unziping?