北師大版高中英語選修八unit22environmentalprotectionthetenthperiod教案-閱讀頁
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【正文】 cle individually and do Ex1. While doing Ex1, students may refer to the above information. Check the answers with the whole class. Suggested answers: 1. Surrounded Islands took about three years. The wrapping of the Reichstag took 24 years. 2. Fabric, booms, steel and polypropylene ropes. 3. For 2 weeks Surrounded Islands spreading over kilometers (7 miles) was seen, approached and enjoyed by the public, from the causeways, the land, the water and the air. The Reichstag attracted huge numbers of visitors from around the world. 4. It is easier for some to grasp the wrapping concept and refer to their artworks entirely as wrapping, but the work is more about altering an environment than wrapping — which is only one way to that. Christo and JeanneClaude39。3 in groups. From Ex3 we can learn there are three main reasons for using the passive voice in English: ? to focus on the action rather than the doer ? to put special emphasis on the doer ? to avoid having a long subject in an active sentence The following chart includes sentences changed from the active to the passive in the principal tenses. Active Passive Time Reference They make Fords in Cologne. Fords are made in Cologne. Present Simple Susan is cooking dinner. Dinner is being cooked by Susan Present Continuous James Joyce wrote Dubliners. Dubliners was written by James Joyces. Past Simple They were painting the house when I arrived. The house was being painted when I arrived. Past Continuous They have produced over 20 models in the past two years. Over 20 models have been produced in the past two years. Present Perfect They are going to build a new factory in Portland. A new factory is going to be built in Portland. Future Intention with Going to I will finish it tomorrow. It will be finished tomorrow. Future Simple Oftentimes, when a sentence is in passive voice, the by phrase is deleted. This is because the doer of the action is understood or unknown. The by phrase is only retained (allow to remain in a place or position) when the doer of the action needs to be made clear even though the focus is on the object of the action. Deal with Ex3. Ask students to change the sentences into passive. Use “by ...” only if necessary. Check the answers by having individuals read out the sentences. Deal with Ex4. Ask students to read the sentences with the correct preposition filled in together. Step VI Homework Do Ex5
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