Unit 2 Discover Useful Structures-ppt课件 --(2022)高中英语新人教版选择性必修第三册.pptx
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1、Discover Useful Structures【版本:新人教册别:选择性必修三】UNIT 2 HEALTHY LIFESTYLE目录页contentsLead-inObserve and DiscoverPractice and ApplyHomeworkLead-inLead inTask 1 Read the following sentences and analyze what part does the underlined part serve as in each sentence?1.To change bad habits is never easy.2.It took
2、 the surgeon three hours to finish my mothers lung surgery.3.To join the Peoples Liberation Army,it is required for men to shave off their beards.4.It was not polite to disturb your neighbours with loud music last night.主语主语Lead inTask 2 Compare the following sentences and find the differences of th
3、e subjects.1.To change bad habits is never easy,even with many attempts.2.To prevent harmful habits like these from dominating a teenagers life is essential.3.After all,it is not easy to break bad habits.4.However,during this period,it can be easy for some of them to form bad habits.5.Howtousethecom
4、puterisaquestion.6.Whentogothere hasnotbeendecided yet.Lead in动词不定式作主语有三种形式:1.直接放在 _ 作主语;2.为了保持句子平衡,用_作形式主语,放在句首,把真正的主语动词不定式置于句后;3.和 _ 构成短语作主语。句首it疑问词SummaryIIObserve and DiscoverObserve and Discover1.To see is to believe.2.To do this is to cut the foot to fit the shoe.3.To say is one thing and to d
5、o is another.4.To make a detailed plan is a good idea to make it successful.从位置上看,动词不定式作主语,通常放在句首。当句子主语和表语都是非谓语时,通常要_,例如:To see is to believe.=Seeing is believing.保持一致保持一致Observation 1Discover 1Observe and Discover1.For him to admit his mistakes is not easy.2.For us to finish the composition in a qu
6、arter of an hour is really difficult.动词不定式作主语可以带上自己的 _,一般用for/of短语来表示。但此时多使用形式主语 it 来引起,使得句子保持平衡。例如,第2 2句可以改为:It is really difficult for us to finish the composition in a quarter of an hour.逻辑主语逻辑主语Observation 2Discover 2Observe and Discover1.To be working all day long is a bore.2.To have made the s
7、ame mistake twice is unforgivable.3.To love and to be loved is the great happiness.动词不定式作主语可以有不同的_形式,例如,_,_和_语态。时态和语态时态和语态Observation 3Discover 3一般进行时一般进行时完成时完成时被动被动Observe and Discover1.It isnt right to talk like that.2.Its difficult to master English.3.Its hard for me to answer the question.4.It i
8、s better to have loved and lost than never to have loved at all.以上四个句子有两点共同之处:1.句子的真正主语都是_,但都使用it作形式主语;2.句子的表语都是_。动词不定式动词不定式形容词形容词it+be+adj+(逻辑主语逻辑主语)+to do sth Observation 4Discover 4Observe and Discover动词不定式的逻辑主语常用_ _ 来表示,当形容词修饰动词不定式时,此时常用介词_。当表语形容词表示不定式的逻辑主语的性质或特征时,则用介词_。1.It isnt right for us to
9、 stop half way.=To stop half way is not right.2.Its kind of you to think so much of us.=You are kind to think so much of us.for/of+sb forofObservation 5Discover 5Observe and Discover1.Its our duty to do that.2.Its a mistake not to help them.3.It must be great fun to fly to the moon in a spaceship.以上
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