officers是什么意思 policeman是什么意思


课文重点句型巩固
(1) 从单数变复数 , 变形规则如下:
1.一般情况下 , 直接加-s , 如:book-books, bag-bags, cat-cats, bed-beds
2.以s. x. sh. ch结尾 , 加-es , 如:bus-buses, box-boxes, watch-watches
3.以“辅音字母 y”结尾 , 变y为i, 再加-es , 如:family-families(家庭),
strawberry-strawberries(草莓)
4.以“f或fe”结尾 , 变f或fe为v, 再加-es , 如:knife-knives
5.不规则名词复数:
man-men, woman-women, policeman(男警察)-policemen,
policewoman(女警察)-policewomen, mouse-mice  , knife-knives
child(孩子)-children foot-feet,. tooth-teeth leaf-leaves
单复同形:
fish-fish, sheep-sheep ,  people-people, Chinese-Chinese, Japanese-Japanese
6. 注意:当people后加上s时 , 即peoples表示“民族”
例如:There are 56 peoples in China. 中国有56个民族 。
7.不可数名词 :water(水) milk(牛奶) tea(茶) rice(米饭) orange(橙汁)
juice(果汁) bread(面包) , news(新闻、消息)等
注意:用单位词“a…of名词”表示 , 如:
a cup of 一杯…… a bottle of 一瓶……
a piece of 一张…… a basket of 一篮……
a can of 一罐…… a bag of 一袋……
a piece of news 一则新闻 two cups of tea 两杯茶
【officers是什么意思 policeman是什么意思】five pieces of paper 五张纸 two bowls of noodles 两碗面条

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