以sh. ch结尾,加-es,如：brush-brushes, watch-watches还有s. x结尾,也要加-es,如：bus-buses, box-boxes1．一般情况下,直接加-s,如：book-books, bag-bags, cat-cats, bed-beds 2．以s. x. sh. ch结尾,加-es,如：bu...