preterite perfect progressive

agarose billinghursts birewness bubble collimating system cluster-type dkiamond dressing tool correction of scale difference dento-alveolar osteitis disnatural electrician's screwdriver familygram Horse of the Year Show mountain-hiking NACCA overhanging eaves pull a few strings Pībor Wenz (Pibor River) Riefler clock skin decarburization strong protest Tongoloa zhongdianensis