Unit 1 The mass media Grammar and usageppt课件-(2020)新牛津译林版高中英语选择性必修第二册(002).pptx
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1、Unit 1 The mass media Grammar and usageLearning objectivesBy the end of this section, you will be able to:1. understand the usage of the past perfect tense;2. identify the verb form of the past perfect tense;3. use the right forms of the past perfect tense to correct the mistakes and complete an art
2、icle;4. apply the past perfect tense in new situations.Past perfect Look at the sentences and answer the questions.In sentence (a), which action happened first, “suspected” or “evolved from a common ancestor”? In sentence (a), “evolved from a common ancestor” happened first.aDarwin suspected that th
3、e finches had evolved from a common ancestor, . bMany people refused to believe that living things, including humans, had evolved from lower forms of life. Lead inIn sentence (b), which action happened first, “refused to believe” or “evolved from lower forms of life”? In sentence (b), “evolved from
4、lower forms of life” happened first. aDarwin suspected that the finches had evolved from a common ancestor, . bMany people refused to believe that living things, including humans, had evolved from lower forms of life. Past perfect Look at the sentences and answer the questions.Lead inIt indicates th
5、e action happened before a certain past action. aDarwin suspected that the finches had evolved from a common ancestor, . bMany people refused to believe that living things, including humans, had evolved from lower forms of life. Past perfect Look at the sentences and answer the questions.Lead inComp
6、lete the paragraphs with the information from the given sentences. The sentences are in the order in which they happened. 1a Natural disasters led to food shortages in the 1960s. b Yuan Longping began to do research on hybrid rice. c Yuan Longping developed a better type of rice. Yuan Longping 1 to
7、do research on hybrid rice because natural disasters 2 food shortages in the 1960s. In the end, he 3 a better type of rice. began had led to developedLead in2a Gregor Mendel chose to study pea plants because their characteristics were easy to control. b Gregor Mendel made important discoveries about
8、 genetics.c Gregor Mendel died in 1884. Gregor Mendel 4 study pea plants because their characteristics were easy to control. By the time of his death in 1884, he 5 important discoveries about genetics. chose to had madeComplete the paragraphs with the information from the given sentences. The senten
9、ces are in the order in which they happened. Lead inExploring the rulesRead the short life story of Joseph Pulitzer and find the sentences that use the past perfect tense. The first one has been done for you.by then he had learnt very little English. by the age of 25, he had become a publisher.He us
10、ed the same business strategy he had employed at the St Louis Post-DispatchExploring the rulesWorking out the rulesWe often use the past perfect tense to talk about something that happened (1) _ (before/after) a past action or state.The verb form of the past perfect tense is “(2) _ (have/had) done”.
11、beforehadExploring the rulesGrammar notes过去完成时过去完成时过去完成时的概念与结构特点过去完成时的概念与结构特点概念概念:过去完成时表示在过去某一时间或动作之前已经发生或完成了的动作,即“过去的过去( past-in-the-past )”。-|- |-|-那时以前 那时 现在Grammar notes过去完成时过去完成时构成构成:过去完成时由“助动词 had + 过去分词”构成,其中 had 通用于各种人称。 They had already had breakfast before they arrived at the hotel. She ha
12、d finished writing the composition by 10: 00 this morning.Grammar notes过去完成时过去完成时过去完成时的过去完成时的用法用法1. 过去完成时用来描述过去某一时间之前发生的动作或存在的状态。 He had tried his best although he failed. It surprised me that she had been out of work for a year.2. 过去完成时有时用来表示没有实现的愿望,主要用于want 、 hope 、 intend 等词。 I had wanted to help
13、 you, but I was too busy then.Grammar notes3. 过去完成时可以用于 hardly . when .或 no sooner . than . 等结构,表示“一就”。 I had hardly entered the classroom when the bell rang. No sooner had he got to the station than the bus arrived.4. 过去完成时常有 by 、when 等引导的时间状语作为标志。 I had finished reading the novel by the end of las
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