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1、Unit4PublictransportPeriod1WelcometotheUnitAims:1. to get the students to talk about different means of transport and its main function.2.Students are expected to discuss the advantages and disadvantages between all these means of transport and how important they are to our lives.【要点探究】1、accele
2、rate【课文原句】ThesenewwaysofdiggingacceleratedthepaceoftheLondonUnderground’sdevelopment.【点拨】accelerate在此句中为及物动词,意为"加速,促进"。又如:Reformsanddevelopmentinhealthandsportshavebeenacceleratedinrecentyears.Thedriveracceleratedhiscartocatchupwithme.【拓展】accelerate的反义词是decelerate,意为"降低速度,减速"。例如:Thecardecelerat
3、edastherewasapolicecarbeforeit.accelerate的名词形式是acceleration,表示"加速,加快；加速度"。例如:Wehaveseenanaccelerationintherateofeconomicgrowthinrecentyears.2、permit【课文原句】Visitourticketofficeandbuyoneofthetravelcardsthatpermityoutotravelallovertheundergroundsystem.【点拨】permit在此句中作及物动词,意为"允许,准许,许可"。后面可跟名词、代词和不定式等
4、的复合结构。又如:Wedon’tpermitchildrentoswiminthepool.Nooneispermittedtosmokehere.【拓展】(1)permit还可以用作不及物动词,表示"允许；使有可能",多用于状语中。Weatherpermitting;we’llgocampingthisweekend.IwillgotherethisSeptemberifmyhealthpermits.(2)permit的过去式、过去分词和现在分词分别是permitted,permitted和permitting。名词形式为permission,意为"允许,准许"。(3)permi
5、t还可用作名词,表示"许可证,执照,通行证"。例如:Youcan’tstayherewithoutaworkpermit.3、undertake【课文原句】WhenIfirstundertooktheproject,IfoundtheinformationconfusingbecauseIdidn’tknowhowtoorganizeit.【点拨】undertake在此句中作及物动词,意为"承担,担任",其过去式和过去分词分别是undertook和undertaken。又如:ItwasthehardestjobIhadeverunder-taken.Shecouldn’tundert
6、aketheresponsibilitybecauseshewastooyoung.【拓展】undertake还可以表示"着手做,从事；同意,答应",后跟不定式。例如:Nextletusundertaketopreparefortheparty.Heundertooktofinishthetaskbythisweekend.4、sacrifice【课文原句】Itwasannoyingwhenallmyclassmateswereamazedandlaughedatmebecausetheyhadneverseenmesacrificesomuchforanassignment.【点拨
7、】sacrifice在此句中作及物动词,意为"牺牲,奉献"。又如:Hisparentssacrificeeverythingtheyhaveforhisstudy.Wedecidedtosacrificeatripforanewcar.【拓展】sacrifice还可以用作名词,表示"牺牲,奉献；祭品"。常见固定搭配:makesacrificestodosth.。例如:12用心爱心专心Successinyourjobisnotworththesacrific
