人教版高中英语必修二Wildlife protection-period21.doc

AimsA. To learn about The Present Progressive Passive VoiceTo discover useful words and expressionsTo discover useful structures.ProceduresI. Warming up by acting a text playGood morning class. To begin with we shall put our text HOW DAISY LEARNED TO HELP WILDLIFE on stage, that is, to act out our story. Now the class acting team with their text play of HOW DAISY LEARNED TO HELP WILDLIFE! II. Discovering useful words and expressions1. Doing vocabulary exercisesTurn to page 28 and do the vocabulary exercises 1, 2 and 3. You can simply write your answers in the blanks on the very page of 28.2. Playing a gameLets go on to play the game described on the top of the page 29. The following sentences are to be passed on. Plant native plants in your backyard. Do not dump weeds in the bush. Build a frog pond in your backyard. Put your rubbish in the bin. Leave your pets at home. Do not take anything out of the park. Encourage your friends to keep patches of bush as wildlife habitats. Join a community group and offer to do voluntary work. Find out about conservation activities happening in your local area. Participate in local clean-up, tree planting and weed control activities. Learn About Threatened Species Look out for wildlife Refuse to buy any rare or endangered plant or animal product. Be alert and drive slowly at dawn and dusk in rural areas where wildlife may be active. B. III. Studying The Present progressive Passive Voice1. Passive Voice The passive voice is used when focusing on the person or thing affected by an action. The Passive is formed: Passive Subject + To Be + Past Participle It is often used in business and in other areas where the object of the action is more important than those who perform the action. For Example: We have produced over 20 different models in the past two years. Changes to: Over 20 different models have been produced in the past two years. If the agent (the performer of the action) is important, use “by.” For Example: Tim Wilson wrote The Flight to Brunnswick in 1987. The Flight to Brunnswick was written in 1987 by Tim Wilson. Only verbs that take an object can be used in the passive. The following chart includes sentences changed from the active to the passive in the principal tenses. Active PassiveTime Reference They make Fords in Cologne. Fords are made in Cologne.Present SimpleSusan is cooking dinner. Dinner is being cooked by SusanPresent ContinuousJames Joyce wrote Dubliners. Dubliners was written by James Joyces.Past SimpleThey were painting the house when I arrived. The house was being painted when I arrived.Past ContinuousThey have produced over 20 models in the past two years. Over 20 models have been produced in the past two years.Present PerfectThey are going to build a new factory in Portland. A new factory is going to be built in Portland.Future Intention with Going toI will finish it tomorrow. It will be finished tomorrow.Future Simple2. Passive Verb FormationThe passive forms of a verb are created by combining a form of the “to be verb.” with the past participle of the main verb. Other helping verbs are also sometimes present: “The measure could have been killed in committee.” The passive can be used, also, in various tenses. Lets take a look at the passive forms of “design.”Tense Subject AuxiliaryPast Participle Singular Plural Present The car/cars is are designed. Present perfect The car/cars has been have been designed. Past The car/cars was were designed. Past perfect The car/cars had been had been designed. Future The car/cars will be will be designed. Future perfect The car/cars will have been will have been designed. Present progressive The car/cars is being are being designed. Past progressive The car/cars was being were being designed. IV. Reading and identifyingC. Since you are clear about Passive Verb Formation, go back to page 26 and scan the text for all the examples of The Present Progressive Passive Voice. Our fur is being used to make sweaters like yours.She was being watched by an excited elephant.D. Now try to put the following sentences into The Present Progressive Passive Voice. They are producing this new drug. Antelope is looking at her. They are killing us for the wool. They are destroying the farm.E. V. Discovering useful structuresF. To consolidate your learning of The Present Progressive Passive Voice, turn to page 29 and do the grammar exercises 1, 2 and 3, also on the very page of 29.VI. Closing down by playing