人教課標(biāo)高二選修6Unit4Unit4Globalwarmingit的用法(二)it在強(qiáng)調(diào)句型中的用法

觀察下面幾組句子中it的用法,然后加以總結(jié)。1.【語境展示】

a.Itwascholerathatkilledhim.b.ItwasIristhat/whofoundhimthere.c.It's

Lawrence

that

/who

/whomyoushouldbetalkingto.d.Itwasthreeweekslaterthatheheardthenews.【歸納】強(qiáng)調(diào)句型的基本結(jié)構(gòu)是：Itis/was+被強(qiáng)調(diào)部分+that/who/whom+句子的其余部分，被強(qiáng)調(diào)部分指人時，用who(強(qiáng)調(diào)賓語也可用whom)或that，指事物時用_____。that2.【語境展示】

a.Wasitinthisyearthatthewarbrokeout?b.Isit

Tracy

that/whomyouarelookingfor?

【歸納】強(qiáng)調(diào)句型的一般疑問句形式是：Is/Wasit+被強(qiáng)調(diào)部分+that/who/whom+句子的其余部分。3.【語境展示】

a.Whyisitthateveryonethinksheisselfish?b.Whatwasitthattheyfoughtfor?

【歸納】強(qiáng)調(diào)句型的特殊疑問句形式是：

________+is/wasitthat+句子的其余部分。疑問詞4.【語境展示】

a.ItwasbecauseIwantedtobuyadictionarythatIwenttotownyesterday.b.Itiswhathesaidjustnowthatmakesmeangry.

【歸納】強(qiáng)調(diào)句型也可強(qiáng)調(diào)狀語從句、名詞性從句等。5.【語境展示】

a.Itmustbeyourmotherthat

/who

/whomyouarethinkingof.b.Itmightbemytwosistersthat/whoknowherbest.

【歸納】

在強(qiáng)調(diào)結(jié)構(gòu)中，be前可使用表示推測的情態(tài)動詞。6.【語境展示】

a.Itisnotuntiltheendoftheyearthatthetrafficlawswilltakeeffect.b.Itwasnotuntilhewasthirtythathestartedtopaint.

【歸納】

not...until

句型的強(qiáng)調(diào)句的形式是：

Itis/wasnotuntil+被強(qiáng)調(diào)部分+that+句子的其余部分。3.Tomwentto

London

onTuesday.__________________________________________________________________4.Wewillwaitforhim

atthecoachstation.__________________________________________________________________5.Theydid

not

seeeachotheragain

until

thefall.__________________________________________________________________ItwasonTuesdaythatTomwentto

London.Itisatthecoachstationthatwewillwaitforhim.Itwasnotuntilthefallthattheysaweachotheragain.FinishExercise2onpage29:RewriteeachsentencewithItis…that/who…togivemoreemphasistotheunderlinedpart.Scientistswarnedthatgreenhousegaseswouldwarmtheearthbytrappingheatenergyintheatmosphere.Itwasscientistswhowarnedthatgreenhousegaseswouldwarmtheearthbytrappingheatenergyintheatmosphere.2.Thegreenhouseeffectgivestheearth’ssurfacetheaveragetemperatureof15℃.Itisthegreenhouseeffectthatgivestheearth’ssurfacetheaveragetemperatureof15℃.3.Muchoftheenergyusedtolightandheartourhomescomesfromfossilfuels.Itisfossilfuelsthatmuchoftheenergyusedtolightandheatourhomescomefrom.4.Thedevelopedcountriesconsumethemostenergyintheworld.Itisthedevelopedcountriesthatconsumethemostenergyintheworld.5.Carbondioxidehasthetendencytostayintheatmosphereforcenturieswhileothergreenhousegasesstayintheatmosphereonlyforadayorless.Itisforcenturiesthatcarbondioxidehasthetendencytostayintheatmospherewhileothergreenhousegasesstayintheatmosphereonlyforadayorless.6.Low-lyingcountriesfeeltheirveryexistenceisindangerfromrisingsealevels.Itistheirveryexistencethatlow-lyingcountriesfeelisindangerfromrisingsealevels.7.Environmentalistshavetriedtostoptheearth’stemperaturerising.Itisenvironmentalistswhohavetriedtostoptheearth’stemperaturerising.8.Scientistswanttofindoutaboutfutureclimatechangesandtheireffectsonourenvironment.Itisfutureclimatechangesandtheireffectsonourenvironmentthatscientistswanttofindoutabout.9.Intheyearsahead,theleveloftheseacouldrisebyseveralmetersbecauseofglobalwarming.Itisseveralmetersthattheleveloftheseacouldriseintheyearsaheadbecauseofglobalwarming.10.Inthefutureouterspacemightprovideuswithnewenergysources.Itisoutspacethatmightprovideuswithnewenergysourcesinthefuture.Explanationaverage

閱讀下面句子，并試著歸納average的意思及用法。1.【語境展示】

Theageoftheworkersrangedfrom29to49withanaverageageof37.

【歸納】作形容詞,意為:________。

平均的2.【語境展示】

InanaverageweekIdriveabout250miles.

【歸納】作形容詞,意為:普通的,平常的,一般的。

3.【語境展示】

Theaverageofthethreenumbers7,12and20is13.

【歸納】作名詞,意為:平均數(shù)。

4.【語境展示】

Onaverage,menstillearnmorethanwomen.Temperaturesareabove/belowaverageforthetimeofyear.

【歸納】

作名詞,意為:平均水平，一般水準(zhǔn)。

(常用于以下結(jié)構(gòu)：__________平均;above/belowaverage在平均水平以上/以下。)

onaverage5.【語境展示】

Economicgrowthisexpectedtoaverage2%nextyear.

【歸納】作動詞，意為“平均為”。對畫線部分內(nèi)容進(jìn)行強(qiáng)調(diào)。1.

Thewashingmachine

needsrepairing.______________________________________________________________2.Imet

Henry

in

NewYork.______________________________________________________________Itisthewashingmachinethatneedsrepairing.ItwasHenrythat/who/whomImetin

NewYork.3.Tomwentto

London

onTuesday.__________________________________________________________________4.Wewillwaitforhim

atthecoachstation.__________________________________________________________________5.Theydid

not

seeeachotheragain

until

thefall.__________________________________________________________________Itwason