常规名词
大部分的名词在加上 -s 后缀来形成复数。
比如：
| 单数 | 复数 |
|---|---|
| boat | boats |
| house | houses |
| cat | cats |
| river | rivers |
以 s, x, z, ch, sh 结尾的名词在后边加上 -es 形成复数。
比如：
| 单数 | 复数 |
|---|---|
| bus | buses |
| wish | wishes |
| pitch | pitches |
| box | boxes |
以 y 结尾并且 y 前面是辅音字母的名词，通过去掉 y ，并且在后边加上 -ies 形成复数。
比如：
| 单数 | 复数 |
|---|---|
| penny | pennies |
| spy | spies |
| baby | babies |
| city | cities |
| daisy | daisies |
非常规名词
还有一些名词的复数没有具体的规律，常见的一些如下：
| 单数 | 复数 |
|---|---|
| woman | women |
| man | men |
| child | children |
| tooth | teeth |
| foot | feet |
| person | people |
| leaf | leaves |
| mouse | mice |
| goose | geese |
| half | haives |
| knife | knives |
| wife | wives |
| life | lives |
| elf | elves |
| loaf | loaves |
| potato | potatoes |
| cactus | cacti |
| focus | foci |
| fungus | fungi |
| nucleus | nuclei |
| syllabus | syllabi/syllabuses |
| analysis | analyses |
| diagnosis | diagnoses |
| oasis | oases |
| thesis | theses |
| crisis | crises |
| phenomenon | phenomena |
| criterion | criteria |
| datum | data |
还有一些名字的复数形式和单数形式一样。
比如：
| 单数 | 复数 |
|---|---|
| sheep | sheep |
| fish | fish |
| deer | deer |
| species | species |
| aircraft | aircraft |
非常规的动词名词结合使用
有些名词是复数形式，但是和单数的动词一起使用。
比如：
| 和单数动词一起用的复数名词 | 例句 |
|---|---|
| news | The news is at 6:30 p.m. |
| athetics | Athetics is good for young people. |
| linguistics | Liguistics is study of language. |
| darts | Darts is a popular game in England. |
| billiards | Billiards is played all over the world. |
有一些名词的复数和复数动词具有固定的用法。他们不能用在单数形式，或者在单数形式有不同的意思。这写名词包括： trousers, jeans, glasses, thanks, steps, stairs, customs, congratulations, tropics, wages, spectacles, outskirts, goods, wits.
| 复数名词和复数动词 | 例句 |
|---|---|
| trousers | My trousers are too tight. |
| jeans | Her jeans are black. |
| glasses | Those glasses are his. |
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