Unit 15   We’re trying to save the manatees!

sample answers:s1: i think they are living in the water.s2: i believe that they eat aquatic food.s3: i feel that there aren’t many of them.s4: i know that they live in a place where trees grow in water.s5: i think they are endangered. ask the students to listen to the recording. t: very well. i think your answers are all right. manatees in the world are fewer and fewer. we should save them. we should take care of the environment that they are living in. now let’s listen to the tape. first listen to the recording and match the words and definitions in 2a.play the recording for the first time.t: listen again and check your answers.play the recording for the second time. check the answers. t: you’ll hear the same conversation again. this time complete the chart in 2b. put your answers on the line.play the recording again, then check the answers.step v pairwork (2c: p119)t: after listening, we know more about manatees. we know that they are fewer and fewer. the government has passed laws to protect them. they eat a lot of food every day. they are enormous. can you make conversations about the animal in pairs? you can base on the model dialogue in 2c.a sample dialogue:s1: how many manatees are there in the us? s2: about 2,500.s1: where are they living?s2: their favorite habitat is in the water under the trees in mangrove swamps.s1: why are they endangered?s2: some of the swamps have been polluted.s1: do they eat a lot?s2: yes, they do....step vi  grammar (grammar focus: p119)help the students sum up the following patterns. 時(shí)   態(tài)謂語(yǔ)動(dòng)詞的形式 （do）一般現(xiàn)在時(shí)do / does一般過(guò)去時(shí)did現(xiàn)在進(jìn)行時(shí)be (am / is / are) doing現(xiàn)在完成時(shí)have / has done一般過(guò)去時(shí)被動(dòng)語(yǔ)態(tài)was / were done現(xiàn)在完成時(shí)被動(dòng)語(yǔ)態(tài)have / has been donet: look at the grammar focus box on page 119. now who’d like to read the sentences to the class?ask a student to read the sentences in the box.t: can you make some sentences with the different tenses and passive voice? please write down your sentences in your exercise books.ask the students to do more practicing exercises, such as the following:fill in the blanks with the right forms of the given words.1. every day my mother _____(get) up early.2. the dinosaur eggs _____(discover) many years ago by scientists.3. listen! some children _____(sing) an english song over there.4. in our hometown there used to _____(be) many old trees.5. my work _____(not finish) yet. i can’t go out to play with you.sample answers:1. gets 2. were discovered 3. are singing