1、Unit 21 Lesson 1 Chewing Gum Teaching aims: To read about the effects of chewing gum. To revise conditionals To practice using mixed conditionals Teaching difficulties: some students may not remember the first, second and third conditionals well. The form of mixed conditiona ls may be difficult for
2、some students to master and they may need more practice with it. Teaching Aids: computer and video rejection Teaching procedures: Step 1: lead-in 1. Show students advertisement an video about gum so as to raise their interest on chewing gum and make them think of the effects of chewing gum in daily
3、life. 2. Students work in pairs discussing the questions and require them to share their ideas with class. Discuss in pairs and answer the following questions. What do you think of chewing gum? Is it good or bad for you? Do you or your friends /family buy it? Why? What do you do after chewing it? 3.
4、 Students look at the title and predict which issues may be covered in the article. Then, students work individually, reading the article quickly to find out which of their guesses were right. Step 2: read to learn 1. Students divide the text into four parts, then summarize the main topic of each pa
5、rt. Part 1 (paragraph 1- 1 ) Introduction Part 2 (paragraph 2 - 4 ) Benefits of chewing gums Part3 (paragraph 5 - 7 ) The negative sides of chewing gums Part4 (paragraph 8- 8 )Better activities than chewing gums 2. Work individually, students try and fill the table with the information they remember
6、 from the first reading. After finishing the table, students discuss it with each other and then check answers as a class. Advantage Disadvantage Helping people: 1. fight bad breath 2. prevent/ stop tooth decay 3. lose weight 4. give up smoke 1.making digestions more difficult 2. Causing feelings of
7、 sickness or headaches 3. Leading to stomach sickness 4. Making people neglect brushing their teeth 3. Students work in pairs answering the questions. Ask them to locate the relevant parts in the text which give the answers. 1. How serious is the problem of bad breath? 2. What is added to sugar-free
8、 chewing gum which may help prevent tooth problems? 3. According to one research project, what is one way of burning 70 kilocalories? 4. What would be the effect on the stomach of constant chewing? 5. What other activities are stated that are better than chewing gum? Step 3: grammar 1. Students matc
9、h the conditional sentences in italics in the text with the following types: zero conditional, 1st conditional, 2nd conditional, 3rd conditional. Check students answers by having individuals read out the sentences and then describe them. 2. Elicit an example from the class of each conditional form. Step 4: consolidation Choose the best answer. Step 5: Homework: page 80, Ex1, 4
