tooth的复数形式(6-2 名词的复数形式)

tooth的复数形式
你知道构成名词复数形式有哪几种吗？

PLURAL FORMS OF NOUNS 
名词的复数形式

名词复数形式构成方式如下：

a. To make most nouns plural, add -s. 
多数名词的复数形式是后面加 -s.

one match

one class

one box two dishes

two matches

two classes

two boxes

b. Add -es to nouns ending in -sh, ch, -ss and -x. 
以 -sh, ch, -ss 和 -x结尾的名词，后面加 -es. 

one city two babies

two cities

c. If a noun ends in a consonant + -y, change the y to i and add -es, as in (c).
辅音+ y结尾的名词，把 -y变成-i, 再加 -es. 

one key two toys

two keys

d. If -y is preceded by a vowel, add only -s, as in (d).
元音 + y 结尾的名词，直接加 -s. 

one shelf two knives

two shelves

e. If a noun ends in -fe or -f, change the ending to -ves. 
(Exceptions: beliefs, chiefs, roofs, cuffs, cliffs.)

以-fe或-f结尾的名词，把-fe或-f都改成 -ves， 
但不包括这些单词 beliefs, chiefs, roofs, cuffs, cliffs.

one zoo

one zero two tomatoes

two zoos

two zeroes/zeros

f. The plural form of nouns that end in -o is sometimes -oes and sometimes -os. 
以-o结尾的名词，有些加-oes, 有些加 -os.

-oes 结尾: tomatoes, potatoes, heroes, echoes
-os 结尾 : zoos, radios, studios, pianos, solos, sopranos, photos, autos, video
-oes or -os (两者都可以）: zeroes/zeros, volcanoes/volcanos, tornadoes/tornados, mosquitoes/mosquitos

one foot

one goose

one man

one mouse

one tooth

one woman

_________ two children

two feet

two geese

two men

two mice

two teeth

two women

two people

g. Some nouns have irregular plural forms. 
(Note: The singular form of people can be person, woman, man, child. For example, one man and one child = two people.)

有些名词的复数形式不规则。

（注：人的单数形式可以是 person, woman, man, child.
例如: one man and one child = two people.）

one fish

one sheep

one offspring

one species two deer

two fish

two sheep

two offspring

two species

h. The plural form of some nouns is the same as the singular form. 
有些名词的复数形式与单数形式相同。

one cactus

one crisis

one phenomenon two bacteria

two cacti

two crises

two phenomena

i. Some nouns that English has borrowed from other languages have foreign plurals. 
一些从其他语言中借用的英语名词保留了它们的外来语复数形式。

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