在英语中，如果要表示两本书，三个学生，四把椅子这些两个或两个以上的概念时，要用名词的复数形式。
词形变化规则
1 规则变化的复数形式
a 一般情况下 加 –s
book—books pen—pens girl—girls
b 以s, x, ch, sh, o 结尾的加-es
bus—buses box—boxes watch—watches dish—dishes tomato-- tomatoes
c 以辅音字母加 y 结尾的单词把y 变成I 加 –es
city—cities country—countries baby—babies
d 以f 或fe 结尾的 去掉f 或fe。变成v 加-es
leaf—leaves knife—knives life-- lives
2不规则变化的复数形式
a 元音发生变化: man—men woman—women foot—feet tooth—teeth mouse –mice
b 词尾发生变化: child—children
c 单复数形式相同: fish—fish deer—deer sheep—sheep
练习
I 请用括号中名词的复数形式填空
1 Look at those _______. (child)
2 I can see a __________ standing near the door. (policeman)
3 Do you want some ________ for dinner? (potato)
4 In autumn, you can see a lot of _______ on the ground.(leaf)
5 He has two _______.One is blue , the other is yellow.( box)
6 Two ________ live in this building .( family )
II 选择正确的词形
1 How many (radioes, radios) can you see?
2 There are 36 (boys, boies) in my class.
3 Look at those (sheeps, sheep).
4 I don’t want (a, an) old cup.
5 Give me that (box, boxes), please.
III 将以下单复数句进行转换
1 This is a knife. ______________________________________
2 That is a tomato. ______________________________________
3 That child is very good._____________________________________
4 These are mice. ______________________________________
5 Those are children. ______________________________________
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