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复数的变换

1.在后面加s。如：fathers, books, Americans, Germans, apples, bananas

2.x, sh, ch, s, tch后加es。如：boxes, glasses, dresses, watches, wishes, faxes

3.(1)以辅音字母加y结尾的变y为i再加es 如：baby-babies, family-families, duty-duties, comedy- comedies, documentary-documentaries, story-stories

(2)以元音字母加y结尾的直接加s。如：day-days, boy-boys, toy-toys, key-keys, ways

4.以o结尾加s(外来词)。如：radios, photos, 但如是辅音加o的加es：如: tomatoes西红柿, potatoes马铃薯

5.以f或fe结尾的变f为v再加es(s)。如：knife-knives, wife-wives, half-halves, shelf-shelves, leaf-leaves, yourself-yourselves

6.单复数相同(不变的)有：fish, sheep, deer鹿子, Chinese, Japanese

7.一般只有复数，没有单数的有：people,pants, shorts, shoes, glasses, gloves, clothes, socks

8.单词形式不变，既可以是单数也可以是复数的有：police警察局，警察, class班，同学, family家，家庭成员

9.合成的复数一般只加主要名词，多数为后一个单词。如：action movie-action movies, pen pal-pen pals; 但如果是由man或woman所组成的合成词的复数则同时为复数。如：man doctor-men doctors, woman teacher-women teachers

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