可数名词复数不规则变化有以下情况：

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1. 集体名词
集体名词是个小群体，本身就是复数(不表示单个)，常见的有audience,people(人), cattle, police,sheep等, 然而people在表示“民族”的时候，却又不是集体名词，例如: China is a people of diligence. (中华民族是个勤劳的民族)。还有一些像the English，the French，the Chinese等表示“某国国民”的词，也是复数。
2. 一些特殊的词
children, feet, teeth, women, men, mice....这些词的单复数形式相差挺大，但因为他们特殊，多看几遍肯定就记住了，不会造成困扰的。

3. 合成名词的复数形式
  1) 没有连字符的合成名词，如supermarket, blackboard....将market, board....转化为复数supermarkets, blackboards即可。
  2) 如果构成合成词的两个都是名词，将后一个词转化为复数(shop-assistants, mail-boxes)；但如果一个是名词，另一个不是，则将名词转化为复数(常见的有standers-by, lookers-on)。
  3) 当第一个词是man或者woman时，两个都要变，见men servants, women teachers。

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一些练习：
1.All the ______ in the hospital went Skating last month.
a. women doctors b. women doctor c. woman doctors d. woman doctor
解答：参照合成名词的复数形式第三条。应该选women doctors。

2.Generally, there are ______ television programs for children on Sundays.
a. little b. much c. a large number of d. less than
解答：television programs是复数形式的合成词，选C。

3. ______ the first and largest group to work on the construction of the railroad.
a. Chinese were b. The Chinese was c. Chinese was d. The Chinese were
解答：按照句意可判断要选择的是“中国人”，the Chinese指的是全体人民，复数，选D。

4.A group of spectators was dispersed by the police who ______ at the scene of the accidents within minutes.
a. were b. have been c. was d. has been
解答：police是集体名词，表复数，选A。

5. There must be three __ in the room.
a. mice b.mouses c. mices d.mouse
解答：mouse(老鼠)的复数形式是mice，选A。