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英语中以f结尾的可数名词有100多个.其中: ①直接加s的有: serf belief roof gulf chief cliff proof safe stuff ②须改f为ves的有 calf life loaf self sheaf shelf thief wife wolf ③既可直接加s,又可改f为ves的有: dwarf hoof hankerchief neckchief oaf scarf turf wharf ④bee,staff的复数虽然有两种方式,但含义不同: staffs staves beeves beefs | 
