1．单复数词形相同

如: people, fish, Chinese(某国人), aircraft, means, series, species，sheep, deer, aircraft等

2．外来词保留了原来的复数形式, 这一点需要重点掌握, 如:

basis-bases analysis-analyses crisis-crises

medium(媒体)-media datum(数据)-data curriculum(课程)-curricula

larva(幼虫)-larvae criterion(标准)-criteria phenomenon(现象)-phenomena

3．通常只以复数形式出现的词语, 如:

clothes trousers compasses(圆规) scales(天平) savings(储蓄),

statistics(统计数据), headquarters(总部)，

4．复数形式有特殊意义的词语, 如:

goods(货物), manners(礼貌), troops(军队), authorities(当局)

5．不规则的名词复数

child - children mouse - mice louse - lice

tooth - teeth foot - feet

6．注意：有一些结尾是-s的词, 但是要当作单数看待, 如: physics, politics, mathematics是表示学科的不可数名词

例题：

(1) With the incorporation of jazz history into current academic curricula, leading jazz musicians are now founding on the faculties of several universities.

(2) Like some other running birds, the sanderling lacks a back toe and has a three-toed feet.

应改为：foot

解释：feet是foot的复数形式, 不定冠词a 之后应接可数名词的单数, 故将feet 改为单数

词汇：sanderling: 三趾滨鹬

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