高二是高中学习的关键时期，不仅课程任务重，而且很大程度上决定着学生今后的发展方向，以及能否考入理想的大学。下面是考高分教育小编整理的高中英语知识点：名词的双重性，希望对同学们有所帮助。
· 知识点
特别注意高考热点——部分名词的双重性
1. 抽象名词单独使用或表泛指意义或用在某一固定介宾结构中，是不可数名词；词义的变化，抽象名词具体化，是可数名词。
例如：
life，time，knowledge，sight，pleasure，repair，paper，glass，hair，food，fruit，character，experience，trouble，difficulty，work，help，population，iron 等。
请注意以下各组例句：
Life is hard.
We’re living a happy life under the leadership of the Party.
Time is money.
We had a wonderful time in the party.
Knowledge is power.
A knowledge of English is a must in the 21st century.
He has poor sight because he often reads in the sun.
The sunset is a beautiful sight.
Would you please lend me your bike？
With pleasure.
What a pleasure it is to meet you here again.
It is said that the road is under repair.
It is said that the workers are doing repairs to the road.
Paper is made from wood.
Our monitor is helping our teacher to hand out the papers.
Have you finished your papers on pollution？
Is there anything of interest in today’s papers？
Mirrors are made of glass.
Glasses are made of glass.
Asians have black hair and Europeans have fair hair.
Look！ There are a few white hairs on your head.
A man will die without food for seven days.
That was really a delicious food at the party.
Lu Xun succeeded in creating many characters in his works.
Charlie， how many characters have you learnt so far？
Sports are very useful for training character.
Sun Wukong had plenty of experiences on the way to the west to seek the Bible， so he had rich experience in telling the kind from the bad.
I had great trouble/difficulty in finding your home last year.
Life is full of joys and troubles.
Here is a difficulty for you to get over.
Irons are usually made of iron.
Every means has been tried but none has/have worked.
All means have been tried but none have/has worked.
work： “工作、活儿”不可数名词
“作品、著作、工厂、工程、工事”可数名词
My father still goes to work at 8：00 in the morning while my mother is out of work.
It’s eight o’clock. Let’s get down to work.
This painting of Xu Beihong’s is a valuable work of art.
Lu Xun’s works are popular with many young readers.
The water works supply/supplies fine water to us.
Our army managed to break through the enemy’s defence works.
population： 既可数又不可数
