English verb conjugation
MUST ZIPPER

Regular verb: zipper - zippered - zippered

Affirmation

Simple form	V-ing form
I must zipper you must zipper he must zipper we must zipper you must zipper they must zipper	I must be zippering you must be zippering he must be zippering we must be zippering you must be zippering they must be zippering
Perfect	V-ing perfect
I must have zippered you must have zippered he must have zippered we must have zippered you must have zippered they must have zippered	I must have been zippering you must have been zippering he must have been zippering we must have been zippering you must have been zippering they must have been zippering

Negation

Simple form	V-ing form
I must not zipper you must not zipper he must not zipper we must not zipper you must not zipper they must not zipper	I must not be zippering you must not be zippering he must not be zippering we must not be zippering you must not be zippering they must not be zippering
Perfect	V-ing perfect
I must not have zippered you must not have zippered he must not have zippered we must not have zippered you must not have zippered they must not have zippered	I must not have been zippering you must not have been zippering he must not have been zippering we must not have been zippering you must not have been zippering they must not have been zippering

Interrogative form

Simple form	V-ing form
must I zipper? must you zipper? must he zipper? must we zipper? must you zipper? must they zipper?	must I be zippering? must you be zippering? must he be zippering? must we be zippering? must you be zippering? must they be zippering?
Perfect	V-ing perfect
must I have zippered? must you have zippered? must he have zippered? must we have zippered? must you have zippered? must they have zippered?	must I have been zippering? must you have been zippering? must he have been zippering? must we have been zippering? must you have been zippering? must they have been zippering?

Interro-negative form

Simple form	V-ing form
must I not zipper? must you not zipper? must he not zipper? must we not zipper? must you not zipper? must they not zipper?	must I not be zippering? must you not be zippering? must he not be zippering? must we not be zippering? must you not be zippering? must they not be zippering?
Perfect	V-ing perfect
must I not have zippered? must you not have zippered? must he not have zippered? must we not have zippered? must you not have zippered? must they not have zippered?	must I not have been zippering? must you not have been zippering? must he not have been zippering? must we not have been zippering? must you not have been zippering? must they not have been zippering?