Unit4 Breaking Boundaries 第 2 课时（Using Language 课件)-高中英语（外研社版2019选择性必修第二册）

外研社版高中英语选择性必修二

Unit4BreakingBoundaries

UsingLanguage

Masterthestructureandusageof“it”tostandforformalsubject;learnhowtouse“it”tostandforformalsubjectanduse“It”freelyandcorrectly.LearningObjectivesThinkabouttheformationanduseofitasaemptysubject;

Grammar

Underlinethesentencesbelowinthereadingpassage.Butitisvitalnottotakeanychances....itwasmydutyasadoctortogothereandoffermyhelp.ItisimportanttorememberthatEboladoesntrespectnationalboundaries.ItissoinspiringtohavecolleagueslikeWilton,MaisyandAlfono,notmentionall......itisabsolutelyessentialforusalltocollaboratetocreateaglobalcommunity...

Whatdoes“it”refertoinsentences(a)and(c)?aButitisvitalnottotakeanychances.bButnottotakeanychancesisvital.cItisimportanttorememberthatEboladoesntrespectnationalboundaries.dTorememberthatEboladoesntrespectnationalboundariesisimportant.“It”refersto“nottotakeanychances”insentence(a)and“torememberthatEboladoesntrespectnationalboundaries”insentences(c).

aButitisvitalnottotakeanychances.bButnottotakeanychancesisvital.cItisimportanttorememberthatEboladoesntrespectnationalboundaries.dTorememberthatEboladoesntrespectnationalboundariesisimportant.Whatisthedifferencebetweenthesentencesineachgroup?Whydoestheauthorchoosetousesentences(a)and(c)insteadof(b)and(d)?Thefirstsentencesineachgroupuse“it”asanemptysubjectatthebeginningofthesentences.Thereasonwhysentences(a)and(c)arechosenisthatthesentencesarekeptbalancedandthekeyinformationofthesentencesisemphasised.

summaryItasanemptysubjectit作形式主语It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。

1（1）不定式。句子的谓语可以是：①be+形容词；e.g.Itisimportant________(know)yourlimitations.知道自己的局限性是很重要的。②be+名词；e

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