高一英语下：Unit 19 Modern agriculture 第三课时教案

I. Teaching aims:

　　learn to use “it ” for Emphasis.

　　Similar dialogue presentation with new words and expressions used within

　　II. Teaching aids: slide, pictures

　　Step I Revision

　　Step II word study

　　Finish the exercises in Student book, page 47.

　　Step III Practice

　　Let Ss finish the exercises “vocabulary, 1-3” in page 108, Workbook

　　Step IV Grammar

　　1. give Ss some sentences to translate into Chinese and find out difference and sameness among these sentences (slide show)

It is on this arable land that the farmers produce food for the whole population of china. It was from the early 1990s that scientists started to develop new techniques to increase agricultural production without harming the environment. It was they who/that cleaned the classroom yesterday. It was in the street that I met her father. It was the goat’s eyes that he had seen in the darkness.

2.teach Ss to find out the phrase from the sentence above----It is+被强调部分+that/who…

Translate the following sentences into English: 1.写这本书的人就是玛丽。It is Mary who wrote this book. 2.这个就是长满了美丽的鲜花的花园。It is garden that many beautiful flowers grow in. 3.她就是擅长唱歌的女孩。It is a girl who is good at singing. 4.那就是他叔叔移居纽约的季节。It was for this reason that his uncle moved out of New York. 5. 错的人是我。 It is I who am wrong.

　　4. note:

　　a. 在强调句型中，若被强调部分指人，可以用关系代词who或that；若被强调的是状语，只能用that，不能用when或where。

　　b. 注意与“It is /was…that +clause”主语从句的区别。

　　强调句型与it作形式主语，that从句作真正主语十分相似，但主语从句中It is /was后通常用名词或形容词作表语。强调句型中It is /was后是对主语、宾语或状语的强调成分。

　　5. let Ss find out some sentence with ‘it’ in the text ‘Modern Agriculture’.

It is on this arable land that the farmers produce food for the whole population of China. (paragraph 1) It was from the early 1990s that scientists started to develop new techniques to increase agricultural production without harming the environment. (paragraph 2) It was developed using a technique know as GM. (paragraph 4)  (it is not for Emphasis)

　　3. exercises

　　let Ss finish the exercises in Student’s book, page 47-48, Exx 1-2.

　　let Ss finish the exercises in Workbook, page 109, Exx 1-3.

　　Finish all the exercises in the book.

 

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