-ful表示"充满的" beautiful, careful,useful,helpful,meaningful等-less“无...的”endless,nameless,homeless,helpless,useless,careless等-ous表示“…的”dangerous危险的,poisonous有毒的,mountainous 多山的,prosperous繁荣的,advantageous有利的-able表示"能...的","有...特性的" comfortable,fashionable,changeable,useable,eatable等