外研版 选择性必修第二册Unit 4 Breaking boundaries Using language 课件.pptx

B5U4Usinglanguage

ObservetherulesLookatthesentencesandanswerthequestions.Sentences(a)and(c)arefromthereadingpassage.Activity1aButitisvitalnottotakeanychances.bButnottotakeanychancesisvital.cItisimportanttorememberthatEboladoesn’trespectnationalboundaries.dTorememberthatEboladoesn’trespectnationalboundariesisimportant.1Whatdoes“it”refertoinsentences(a)and(c)?2Whatisthedifferencebetweenthesentencesineachgroup?Whydoestheauthorchoosetousesentences(a)and(c)insteadof(b)and(d)?

ObservetherulesLookatthesentencesandanswerthequestions.Sentences(a)and(c)arefromthereadingpassage.Activity1aButitisvitalnottotakeanychances.bButnottotakeanychancesisvital.cItisimportanttorememberthatEboladoesn’trespectnationalboundaries.dTorememberthatEboladoesn’trespectnationalboundariesisimportant.Thefirstsentencesineachgroupuse“it”asanemptysubjectatthebeginningofthesentences.Thereasonwhysentences(a)and(c)arechosenisthatthesentencesarekeptbalancedandthekeyinformationofthesentencesisemphasised.

ObservetherulesNowlookformoresentenceswiththisstructureinthereadingpassage,andsummariseitsuseinyourownwords.Ifeltitwasmydutyasadoctortogothereandoffermyhelp.ItissoinspiringtohavecolleagueslikeWilton,MaisyandAlfonso,......,itisabsolutelyessentialforusalltocollaboratetocreateaglobalcommunitywithasharedfutureofpeaceandprosperity.Activity1it作为形式主语，所代替的是句子的逻辑主语，并无实际词义。这可以保持句子的结构平衡，避免主语太长，显得头重脚轻。

it作形式主语

Itasanemptysubject1.代表不定式(1)It+be+形容词+不定式e.g.,Itisdifficulttotranslatethebook.(2)It+be+名词+不定式e.g.,Itwasherdutytocleantheroom.(3)It+be+介词短语+不定式e.g.,Itwasagainstmyprincipletodothat.(4)It+及物动词+宾语+不定式e.g.,Itcost150yuantobuythedress.

Itasanemptysubject2.代表动名词it代