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《Grammar》精品PPT课件优质课下载
The old man that you met at the school gate is a professor.
The old man is a professor, who is over 80 years old.
The temple which we visited last week dates from Song Dynasty.
The temple, which is a place of interest in our hometown, dates from Song dynasty.
Grammar 1-2. Practice(5m) Find the relative clauses in the text and identify them.
Possible answers:
Mao Zedong wrote a poem in which he dreamed of “walls of stone to hold back clouds and rain till a smooth lake rises in the narrow gorges. ”
The power of the Yangtze River, which is the world’s third longest river, has been harnessed by the Three Gorges Dam.
The Three Gorges Dam, which is the biggest construction project in china since the building of the Great Wall and the Grand Canal, has been built to control flooding and provide hydro-electric power for the central region of China.
4. Sun Yat-sen, who was the leader of the 1911 Revolution, first suggested the idea of a dam across the Yangtze River in 1919.
5. More than a million people who lived in the region have moved from their homes.
Grammar 1-3. Practice(5m) Do activity 1 on page 54.
The key to the questions:
a and d contain essential information;
b and c contain extra information.
a and d don’t, but b and c do because the meaning stands without the extra clause.
The one with extra information.
Grammar 1-4. Summary
定语从句有限制性和非限制性两种。限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开，例如： This is the house which we bought last month. 这是我们上个月买的那幢房子。（限制性） The house, which we bought last month, is very nice.这幢房子很漂亮，是我们上个月买的。（非限制性）
2)当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的，例如： Charles Smith, who was my former teacher, retired last year. 查理·史密斯去年退休了，他曾经是我的老师。 My house, which I bought last year, has got a lovely garden. 我去年买的的那幢房子带着个漂亮的花园。 This novel, which I have read three times, is very touching. 这本小说很动人，我已经读了三遍。
3) 非限制性定语从句还能将整个主句作为先行词, 对其进行修饰, 这时从句谓语动词要用第三人称单数，例如： He seems not to have grasped what I meant, which greatly upsets me. 他似乎没抓住我的意思，这使我心烦。 Liquid water changes to vapor, which is called evaporation. 液态水变为蒸汽，这就叫做蒸发。 说明：关系代词that和关系副词why不能引导非限制性定语从句.
Grammar 1-5. Practice(5m) Do activity 2and 3 on page 54
The key to activity 2:
Sun Yat-sen, who became President of the Republic of China in 1912, died in 1925.
The building of the Grand Canal, which is the world’s longest canal, began in 486 BC.