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1.直接加s：lesson—lessons, pen —pens, 等。
2.以s, x, ch, sh 结尾的加es： bus—buses, box—boxes, 等。
3.以“辅音字母 +y”结尾的，变y为i，再加es：baby—babies, country —countries，等。但是，“元音字母+y”结尾的，则是直接加s：boy—boys,等。
4.以f或fe结尾的，一般将f或fe改为v, 再加es：knife—knives, leaf—leaves，等。
5.以字母o结尾的词加es或s：photo—photos, tomato—tomatoes，等。
6.不规则变化。如：
a.特殊的复数形式：child—children, mouse—mice，等。
b.变oo为ee：foot—feet, tooth —teeth，等。
c.含有man 或woman词语的复数是将a改为e：man—men, Frenchman—Frenchmen，等。如果man或woman作另一名词的定语时,和所修饰的名词一起变为复数： man driver—men drivers， woman doctor—women doctors，等。
d.单复数形式相同：sheep, deer，Japanese等。
考例再现:
1．Last night, there was a food accident. Ten _______ were ill, but no _______ were lost.
A. child; lives B. children; life C. children; lives D. child; life (C)
2．The boy always brushes his _____ before he goes to bed.
A. tooth B. tooths C. teeth D. teeths (C)
3．The Japanese _____ will not leave China until she finishes her study.
A. woman B. women C. man D. men (A)
解析: 从“she”可推测出前面为单数、女性，故选A。
4．Can you see nine ________ in the picture?
A. sheep B. dog C. pig D. horse (A)
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