Present participle; Past participle - zippering - zippered Present - zipper - zipper - zippers - zipper - zipper - zipper Past - zippered - zippered - zippered - zippered - zippered - zippered Future - will zipper - will zipper - will zipper - will zipper - will zipper - will zipper Present conditional - would zipper - would zipper - would zipper - would zipper - would zipper - would zipper Present Perfect - have zippered - have zippered - has zippered - have zippered - have zippered - have zippered Past Perfect - had zippered - had zippered - had zippered - had zippered - had zippered - had zippered Future Perfect - will have zippered - will have zippered - will have zippered - will have zippered - will have zippered - will have zippered Past conditional - would have zippered - would have zippered - would have zippered - would have zippered - would have zippered - would have zippered Imperative - - - zipper - - - - - - - -