Period 4 Grammar 1, Grammar 2课题Period 4 Grammar课型New教学目标1. To enable Ss to know about the active voice and passive voice of the infinitive;2. To enable Ss to know about three tenses of the infinitive;3. To enable Ss to know about a special use of the Infinitive: but + do重点1. about three tenses of the infinitive;2. about a special use of the Infinitive: but + do难点1.How to use passive voice of the infinitive2.How to use the Infinitive: but + do学情分析The Ss can finish the task.教具课件1. A recorder 2. A projector 3. A computer教法explaining and practicing教学程序教学内容师生活动时间分配Step 1Step 2Step 1. RevisionCheck the answers to the Vocabulary Exercises in the Workbook.Step 2. Grammar 11. Ask Ss to divide the examples in Activity 1 on page 34 into two groups. The sentences in group one use the active voice and those in the other group use the passive voice.Suggested Answers:Group one:(a) The wind is strong enough to move sand dunes. (b) We were advised not to go outside. (c) It’s frightening to be cycling to work in a sandstorms. (d) I am the only person in my family to have been in a 10’Step3sandstorm.Group two:(e) There’s nothing to be done.(f) To have been caught in a sandstorm was a terrible experience.2. Ask Ss to observe the various forms of the infinitive and find the rules of the formation.3. Rewrite the sentences using infinitive structures in Activity 2.4. Ask Ss to put the verbs in brackets into the correct infinitive forms in Activity 3 on P34.5. Ask Ss to discuss and make the following conclusion.6. Ask Ss to translate the following sentences(1)妈妈警告我不要独自到河里游泳，因为太危险了。(2)我不想被别人看到穿这么糟糕的衣服。(3)不用假装在睡觉，我知道你醒着呢。(4)你似乎已经...
