Unit4BreakingboundariesUsinglanguageGrammar课件高中英语选择性

选择性必修二

Unit4BreakingBoundariesUsinglanguage--GrammarAfterlearningthelesson,studentsshouldbeableto：1.Learnthestructureandunderstandthemainusageof“It”asanemptysubject.2.Usethegrammaranddescribeacityusing“It”asanemptysubject.LearningAimsLeadinWhathavewelearntaboutit1.Idroppedmywatchanditbroke.2.Thereisaknockonthedoor.Itmustbethepostman.3.What’sthisIt’sanewmachine.4.ItisFridaytoday.5.ItwasverycoldlastMonday.6.ItliesinthesouthofAnhui.7.Itisabout8:30now.8.Itisabout25kmfrommycitytothecapital.9.Itis39degree!Yougotahighfever!somethingsomebodypronoundateweatherplacetimedistancetemperatureActivity1Lookatthesentencesandanswerthequestions.Sentences(a)and(c)arefromthereadingpassage.Butitvitalnottotakeanychances.c.ItisimportanttorememberthatEboladoesn’trespectnationalboundaries.1.Whatdoes“it”refertoinsentences(a)and(c)“It”refersto“nottotakeanychances”insentence(a)and“torememberthatEboladoesn'trespectnationalboundaries”insentences(c).Activity1Lookatthesentencesandanswerthequestions.Sentences(a)and(c)arefromthereadingpassage.Butitvitalnottotakeanychances.b.Butnottotakeanychancesisvital.c.ItisimportanttorememberthatEboladoesn’trespectnationalboundaries.d.TorememberthatEboladoesn’trespectnationalboundariesisimportant.2.WhatisthedifferencebetweenthesentencesineachgroupWhydoestheauthorchoosetousesentences(a)and(c)insteadof(b)and(d)Thefirstsentencesineachgroupuse“it”asanemptysubjectatthebeginningofthesentences.Thereasonwhysentences(a)and(c)arechosenisthatthesentencesarekeptbalancedandthekeyinformationofthesentencesisemphasized.Activity1Lookformoresentenceswiththisstructureinthereadingpassage....itwasmydutyasadoctortogothereandoffermyhelp.ItissoinspiringtohavecolleagueslikeWilton,MaisyandAlfono,notmentionall......itisabsolutelyessentialforusalltocollaboratetocreateaglobalcommunity...It作形式主语

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作用句首避免句子头重脚轻真正的主语替换it无含义todosthv-ingthat从句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.g.Itisagoodidea______(have)alittlenotebook

handy.手边有个小笔记本是个好主意。

③be+介词短语；e.g.Itisagainstthelawtodothat.这样做是违法的。

④及物动词+宾语+不定式e.g.Itgivesmegreatpleasuretoseethe

movie.观看电影让我很高兴。

It做形式主语的基本用法：toknowtohave1（2）动名词。

①用nogood,nouse,greatfun,anewexperience等名词作表语；e.g.Itisfunworkingforhim.为他工作很有意思。②也可用某些形容词作表语；e.g.Doyouthinkitisworthquarrelingwithhim？你认为和他吵值得吗？③一些其他的谓语形式。e.g.Doesitmatterwastingalittlemoney稍微浪费一点钱行吗？

It做形式主语的基本用法：1（3）主语从句。

可以是that引导的；例：

It做形式主语的基本用法：Itisstrangethatithasn‘tbeennoticedbefore.

真奇怪，它以前没有引起注意。Itisawonderthatheisstillalive.

他居然还活着，真是个奇迹。Ithappenedthattheharvestwasbadthatyear.

碰巧，那年的收成不好。ItissaidthattherewasanearthquakeinJapan.

据说日本发生了地震。2It做形式主语时的常用句型：（1）Itisclear/obvious/true/possible/certain/...that...

e.g.Itisobviousthathe'slate.

很明显他迟到了。（2）Itisimportant/necessary/right/strange/natural/...

that...(should)do...

e.g.Itisnecessarythatyoudoenoughexercisesbeforetherace.

你在比赛前做足够的运动是有必要的。（3）Itissaid/reported/learnt/...that...

e.g.Itisreportedthataseven-year-oldgirlwonthegame.

据报道，一个七岁的女孩赢了比赛。2It做形式主语时的常用句型：（4）Itissuggested/ordered/required/...that...(should)do...

e.g.Itissuggestedthatthemeeting(should)beputoff.

人们建议推迟会议。（5）Itisapity/shame/...that...

e.g.Itisapitythatyoudidn'tseesuchagoodfilm.

真可惜你没看到这么好的电影。（6）Ithappens/seems/looks/appears/...that...

e.g.IthappensthatIknowhim.

碰巧我认识他。（7）Itlooks/seemsasif...

e.g.Itlooksasifheiswrong.

看起来像是他错了。2It做形式主语时的常用句型：（8）Itdoesn'tmatterwhether/if...

e.g.Itdoesn'tmatterifyoumissthebus,becausethere's

anotherone15minuteslater.

你错过了这一趟公交车也没关系，15分钟后还有一趟。（9）Ittakes...(sometime)todo...

e.g.Ittookusthreehourstogetthere.

去那里要花费我们三个小时。（10）Itis+形容词+(ofsb)+todo...

e.g.Itiskindofyoutothinksomuchofus.

你为我们考虑那么多，你真是太好了。3①Itisnevertoooldtolearn.

活到老,学到老。②Itiseasiertofallthantorise.

摔倒容易爬起来难。③Itisnousecryingoverspiltmilk.

覆水难收。④Itneverrainsbutitpours.

不鸣则已,一鸣惊人。⑤Itiseasytoopenashopbuthardtokeepitalwaysopen.

创业容易守业难。⑥Ittakesthreegenerationstomakeagentleman.

十年树木,百年树人。

Translation:Proverbswith“It”Activity2Rewritetheunderlinedpartsusingitasanemptysubject.ItisnolongerquitesodifficultforwomenandminoritiestogetrolesinAmericanfilmandtelevision.ItisnowamorerealistichopeforminorityactorstobecomealeadingactorinHollywood.ItismorecommonthanbeforeforwomentowriteanddirectHollywoodfilms.ItisseenasacceptablebyfilmstudiostocastwhiteactorsasAsiancharacters.Activity3Describethecityusingtheinformationprovidedanditasanemptysubject.Beijingtodayismulticultural.

Itisnotasurprisingthingfo