英语语法入门：可数名词
Count nouns have two forms: singular and plural.可数名词有两种形式：单数和复数。The singular form refers to one person or thing:单数形式指一个人或一件物品。
a book; a teacher; a wish; an idea
The plural form refers to more than one person or thing:复数形式指多于一个人或一件物品：
books; teachers; wishes; ideas
Singular count nouns单数可数名词
Singular count nouns cannot be used alone. They must have a determiner:单数可数名词不能单独用。他们必须有一个限定词：
the book; that English teacher; a wish; my latest idea
or a quantifier:一个量词：
some new books; a few teachers; lots of good ideas
or a numeral:一个数词：
two new books; three wishes
Plural forms:复数形式：
We usually add –s to make a plural noun:我们通常在单数名词后加–s：
book > books; school > schools; friend > friends
We add -es to nouns ending in –ss; -ch; -s; -sh; -x在以–ss; -ch; -s; -sh; -x结尾的单词后加-es：
class > classes; watch > watches; gas > gases; wish > wishes; box > boxes
When a noun ends in a consonant and -y we make the plural in -ies...在以一个辅音跟-y结尾的单词后我们加-ies变为复数。
lady > ladies; country > countries; party > parties
…but if a noun ends in a vowel and -y we simply add -s:但是如果一个单词以元音跟-y结尾的单词，我们直接在单词后面加-s。
boy > boys; day > days; play > plays
Some common nouns have irregular plurals:一些普通的单词有不规则复数形式：
Man > men; woman > women; child > children; foot > feet;
person > people
Plural count nouns do not have a determiner when they refer to people or things as a group:当复数可数名词指代一类人或一类事物时，不需要限定词。
Computers are very expensive.
Do you sell old books?
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