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课件网) Unit 6 UNIT 6 Nurturing nature Present perfect continuous To learn the use of present perfect continuous tense To use the present perfect continuous tense to talk about how the environment where you live has changed Look at the sentences from the reading passage and answer the questions. a Wild animals such as these Tibetan antelopes have now been using these passages for years. b …before I know it, we have reached Tanggula Station. 观察归纳 1 1 Which of these statements is true about sentence (a) (1) Wild animals started using these passages in the past. (2) Wild animals used these passages only once. (3) Wild animals still use these passages now. 2 What is the difference between the expressions in red in sentences (a) and (b) a: have been using b: have reached a: have been doing – present perfect continuous b: have done – present perfect a Wild animals such as these Tibetan antelopes have now been using these passages for years. b …before I know it, we have reached Tanggula Station. They are different in form and meaning. a: it means the action is continuous from the past b: it means the action happened once in the past Now look for more sentences with the present perfect continuous tense in the reading passage, and summarise its use in your own words. 1 The train has been racing along steadily since it left Xining. 2 All this time the song “Sky Railway” has been playing inside my head. 3 The Qinghai-Tibet Plateau has been attracting people’s admiration for centuries. 4 Now, thanks to our efforts, passengers from all over the country have been enjoying these magical landscapes. Past Present Future He is visiting the doctor. The use of the present perfect continuous tense. have / has been + v-ing We use present perfect continuous tense for actions that started in the past and continue in the present. 1. 现在完成进行时表示动作从过去某一时间开始一直持续到现在。动作是否继续下去，视上下文而定。 现在完成进行时 e.g. The CCTV has been broadcasting English programs ever since 1977. For years we’ve been demanding better housing and jobs. 2. 强调时间的持续性。 e.g. It has been raining non-stop since last night. I wonder when it will stop. The telephone has been ringing for almost a minute. Why doesn’t someone answer it 3. 现在完成进行时常带有较强的感彩。 e.g. Oh, you have come at last! I have been waiting for you for two hours. 4. 表示重复。 e.g. The weather has been changeable lately. I’ve been having a lot of colds. 5. 现在完成进行时常与all the time, this week / month, all night, these few days, all the morning / afternoon, recently等时间状语以及由since或for引导的短语或从句连用。 e.g. I’ve been writing letters all this evening and I’ve just finished them. She has been expecting a long distance call all night long. 1. 现在完成进行时更强调动作的延续，而现在完成时更多体现在动作已经完成。即现在完成进行时强调动词的延续性，而现在完成时强调动作的结果和影响。 e.g. I have knocked at the ... ...
