迅雷专用高速下载
可数与不可数名词Countable and Uncountable Nouns
可数名词
规则变化
字尾加 -s : mistakes, cats, tips, months, dogs, Americans, bananas,
字尾加 -es : churches, dishes, boxes, kisses, potatoes, tomatoes, heroes
字尾y前为子音，去y改为 -ies : copies, hobbies, countries
字尾为f/fe，去f/fe改为 -ves : wolves, leaves, knives, wives
