2.man总称“人”、“人类”，用单数
people泛指“人们”，表示复数概念:People often work in the day.
指“人”的个体，但只表示复数概念:There are five people in my family.
前面加定冠词指“人民”，表示复数概念:Let’s work for the people.
指“民族”时，有单、复数之分:The Chinese people is a hardworking people.
person强调“人”的个体，有单、复数之分:There are five persons in my family.

3.police总称“警察”，表示复数概念:
policeman强调“警察”的个体，有单、复数之分:My father is a policeman.

4.universe指“宇宙万物”，强调物质概念:
When we talk about the universe，we mean the earth， the sun，the moon and many other stars.
space指“太空”、“宇宙空间”，强调空间概念:
Many countries have sent up the satellites into space.
“空间”、“余地”、“空地”:There is no space on the bus.

5.不同国家的人的单复数:

考点名称：形容词

• 形容词：
  简称adj.或a，形容词用来修饰名词或代词，表示人或事物的性质、状态，和特征的程度好坏与否，形容词在句中作定语，表语，宾语补足语。
  她是一个好学生，她学习努力。She is a good student, and she works hard.
  这辆自行车很贵。This bike is expensive.
  对不起,我现在很忙。I am sorry, I'm busy now.
  你为这次会议做好准备了吗? Have you got everything ready for the meeting?

• 形容词的语法功能：
  一、作定语
  He is the greatest writer alive.他是依然健在的伟大的作家。
  Somewone else has done it.别人已经做了这事。
  二、作补语
  形容词做主语补足语和宾语补足语时,可以表示其现状、状态，也可以表示某一动作的结果，并常用在表示“认为，看待”的动词如believe，prove，consider等候。例如：
  The news made her sad.这消息使他感到非常悲伤。
  Don't marry young.不要早婚。
  三、作状语
  形容词或形容词短语可作状语，形容词作状语时，可以看作是“being+形容词”结构的省略，可表示时间、原因、条件、方式、强调或伴随状况等意义。例如：
  Enthusiastic，they are co-operative.热心的时候他们是很合作的。
  Rich or poor, young or old, we all have problems.不管是穷人还是富人，不管是年轻人还是老人，我们都有问题。
  四、做表语
  The ship was adrift on unknown seas．那艘船在陌生的海域漂流。
  五、做主语
  Old and young joined the discussion.
  Rich or poor meant the same to him.作感叹语
  Very good!Say it again.
  Stupid!He must be crasy.

• 形容词的几个特殊用法：
  most 同形容词连用而不用 the, 表示 " 极,很,非常, 十分"。
  It's most dangerous to be here. 在这儿太危险。
  I cannot do it, it's most difficult. 我干不了这件事，太难了。
  
  "The+形容词比较级..., the+形容词比较级..." 表示 " 越... 就越..."。
  The more you study, the more you know. 你学的越多, 就知道的越多。
  The more I have, the more I want. 我越有就越想要有。
  The more, the better. 越多越好。
  
  " 形容词比较级 + and + 形容词比较级 ", 表示 " 越来越... "。
  It's getting hotter and hotter. 天气越来越热了.
  It's pity he is getting poorer and poorer. 真可怜他越来越穷了。
  The computer is cheaper and cheaper. 计算机越来越便宜。
  The more and more people focus on the meeting next year. 越来越多的人关注明年的会议。
  
  主语+谓语(系动词)+as+形容词原形+as+从句。表示两者对比相同。
  This box is as big as mine. 这个盒子和我的一样大。
  This coat is as cheap as that one. 这件衣服同那件衣服一样便宜。
   I study English as hard as my brother. 我同我兄弟一样学习努力。
  
  the + 形容词 表示某种人。
  He always helps the poor. 他经常帮助穷人。
  I like to have a talk with the young. 我喜欢同年轻人谈话。
  The rich sometimes complain their empty life. 富人有时抱怨他们空虚的生活。
  The police led the old man across the street. 警察领老人横过马路。

  以-ly结尾的形容词
  1） 大部分形容词加-ly可构成副词。但 friendly，deadly，lovely，lonely，likely，lively，brotherly，仍为形容词。
  改错：(错） She sang lovely.　　           （错） He spoke to me very friendly.
  　　 （对） Her singing was lovely.　　（对） He spoke to me in a very friendly way.
  2）有些以-ly 结尾的词既为形容词，也为副词。
  daily，weekly，monthly，yearly，early
  The Times is a daily paper.
  The Times is published daily.

  too+adj.+to句型   “太…而不能”
    He is too young to go to school.
   =He isn’t old enough to go to school.
   =He is so young that he can’t go to school.

• 形容词的位置:
  1.形容词一般放在名词前作定语?  
  单个形容词修饰名词时，一般要放在名词的前面。它们的前面常常带有冠词、形容词性物主代词、指示代词、数词等。例如：?  
  a red flower一朵红花?
  an interesting story一个有趣的故事?  
  six blind men 六个盲人?
  my own house我自己的房子?