Unit 5 Using language -ppt课件 -(2022)新外研版高中《英语》选择性必修第一册.pptx
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1、Unit 5 Revealing natureUsing language1.In sentence(a),which action happened first,“suspected”or“evolved from a common ancestor”?2.In sentence(b),which action happened first,“refused to believe”or“evolved from lower forms of life”?3.What does the structure had done indicate?Activity 1.Look at the sen
2、tences from the reading passage and answer the questions.a Darwin suspected that the finches had evolved from a common ancestor,.b Many people refused to believe that living things,including humans,had evolved from lower forms of life.In sentence(a),“evolved from a common ancestor”happened first.In
3、sentence(b),“evolved from lower forms of life”happened first.It indicates the action happened before a certain past action.Using languagea Darwin suspected that the finches had evolved from a common ancestor,.b Many people refused to believe that living things,including humans,had evolved from lower
4、 forms of life.In each sentence,both the two actions happened in the past,Action B happened first,Action A happened later.In this situation,past perfect is used to describe Action B and simple past is used to describe Action A.SummaryAction AAction BUsing languageActivity 1.Look at the sentences fro
5、m the reading passage and answer the questions.Now look for more sentences with the past perfect tense in the reading passage,and summarise its use in your own words.After Darwin had spent some time in South America,his room on the ship was crowded with samples of the plants and animals he had colle
6、cted.At that time,people believed that all species had appeared on Earth at the same time,and had not changed since.It seemed their beaks had evolved according to what food was available on that particular island.The past perfect is a verb tense which is used to show that an action took place once o
7、r many times before another action/point in the past.Using languageActivity 1.Look at the sentences from the reading passage and answer the questions.The past perfect is formed using had+past participle.Questions are indicated by inverting the subject and had.Negatives are made with had not.Statemen
8、t:You had studied English before you moved to New York.Question:Had you studied English before you moved to New York?Negative:You had not studied English before you moved to New York.What is past perfect tense?DefinitionThe past perfect is a verb tense which is used to show that an action took place
9、 once or many times before another action/point in the past.Past Perfect FormsUsing languageThe past perfect expresses the idea that something occurred before another action in the past.It can also show that something happened before a specific time in the past.past perfectsimple pastPast Perfect Us
10、esUse 1 Completed Action Before Something in the PastUsing languageExamples:1.I _(not see)such a beautiful beach before I went to Kauai.2.I did not have any money because I _(lose)my wallet.3.Tony knew Istanbul so well because he _(visit)the city several times.4._ Susan _(study)Thai before she moved
11、 to Thailand?5.She only understood the movie because she _(read)the book.6.Kristine _(never be)to an opera before last night.7.We were not able to get a hotel room because we _(not book)in advance.8.A:_ you ever _(visit)the U.S.before your trip in 2006?B:Yes,I _ to the U.S.once before.hadnt seenhad
12、losthad visitedstudiedHadhad readhad never beenhadnt bookedHad visitedhad beenUsing languageWith non-continuous verbs(simple past),we use the past perfect to show that something started in the past and continued up until another action(non-continuous verbs)in the past.simple past(non-continuous)past
13、 perfect durationPast Perfect UsesUse 2 Duration Before Something in the Past(Non-Continuous Verbs)Using languageExamples:1.We had had that car for ten years before it broke down.2.By the time Alex finished his studies,he had been in London for over eight years.3.They felt bad about selling the hous
14、e because they had owned it for more than forty years.non-continuous verbpast perfect durationnon-continuous verbpast perfect durationpast perfect durationnon-continuous verbThe words“live”,“work”,“teach”,and“study”are sometimes used in this way even though they are NOT non-continuous verbs.Using la
15、nguageAdverbs such as always,only,never,ever,still and just are usually placed between had and past participle.Examples:You had previously studied English before you moved to New York.Had you previously studied English before you moved to New York?Adverb Placement in Past PerfectUsing languageActive
16、 voice:had+past participlePassive voice:had+been+past participleExamples:George had repaired many cars before he received his mechanics license.(Active)Many cars had been repaired by George before he received his mechanics license.(Passive)Active/Passive Voice in Past PerfectUsing language1.a.Natura
17、l 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 _ to do research on hybrid rice because natural disasters _ food shortages in the 1960s.In the end,he _ a better type of rice.beganhad led
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