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名词的复数一般+S特殊情况例外词尾为s、x、ch、sh→+esch发[k]音时，+Sbus→busesbranch→branchesstomach→stomachsbox→boxedbrush→brushes词尾为z→双写z+esquiz→quizzes(测验）词尾为辅音+y→去y+ies专有名词直接+Scountry→countiesbaby→babiesMary→Marysfamily→familiescity→cities词尾为辅音+O→+es+Stomato→tomatoeshero→heroeshello→hellospiano→pianospotato→potatoescargo→cargoeshippo→hipposphoto→photosecho→echoes(回声）kilo→kilosyo-yo→yo-yos词尾为f、fe→去f、fe+ves+S以ff结尾的，直接+Sleaf→leavesknife→knivesproof→proofscliff→cliffs(悬崖）shelf→shelveslife→livessafe→safes