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1、人教课标高二选修6Unit4Unit4Globalwarmingit的用法（二）性质功能例句代词用作人称代词，代替上文提到的人或事物。–Whoisit?–It’sme.You’vehelpedmealot;I’llneverforgetit.It的用法及强调句型性质功能例句代词用以代替指示代词this或that。–What’sthis?–It’sacomputer．–Whosebookisthat?–It'shers．性质功能例句代词表示时间、天气、距离、价钱等。It’stimeforlunch．It’sraininghard．It’stwomilesfromtheschoolto
2、ourhome．引导词作形式主语,代替由不定式、动名词或从句等表示的真正主语。Itiseasytobuyanewradio.Itisnousetellinghimthat.Itdoesn’tmatterwhethershecomesornot.引导词作形式宾语,代替由不定式、动名词或从句等表示的真正宾语。Ifeelitmydutytohelphim.Wethoughtitnousedoingthat.I’vemadeitclearthatnobodyisallowedtosmokehere.引导词表示强调,其结构是:Itis/was+强调部分+that+原句剩余部分。此结构只限于强
3、调状语、主语和宾语。注意：①如果强调的是人,其后用that或who均可;②如果强调的是物、时间或地点等状语,其后只能用that不用where,when,why。引导词IsawTomyesterdayhere.①ItwasIthat/whosawTomyesterdayhere.②ItwasTomthat/whoIsawyesterdayhere.③ItwasyesterdaythatIsawTomhere.④ItwasherethatIsawTomyesterday.引导词注意:若原句是not…until句型,在强调until部分时,要把否定形式放入被强调部分。例如:Hedidn’
4、tleaveuntillreturned.=ItwasnotuntilIreturnedthatheleft.易与强调句型*若强调谓语,则用do/does/did+动词原形,常译为“的确”“一定”等,该结构只能用于陈述句或祈使句中。引导的强调句与其它从句的区别在于：Dobepatient!(一定要耐心点)HedoeswanttolearnEnglishwell.(他的确想学好英语。)ItwasintheplacethatIwasborn.(强调句)ItwastheplacewhereIwasborn.(定语从句)混淆的其它从句①强调句型中前后时态应一致;②被强调的部分为主语、宾语和
5、状语,若把itis/was和that/who去掉,剩下的词语能重新组成正确的句子,而且不缺成分,否则就是其它从句。Itwasin1945thatWorldWarIIended.(强调句)Itwas1945whenWorldWarIIended.(定语从句)③ItwasalongtimesinceImetyoulast.(时间状语)Itistimethatyouwenttobed.(定语从句)口诀代词it本意它,既可指这又指那;时间天气均可指,谈到距离也用它;假主假宾均可做,强调句型跟that。Wasitonalonelyisland______hewassavedonemontha
6、ftertheboatwentdown?A.whereB.thatC.whichD.what从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。2.Itisnothowmuchwedobuthowmuchloveweputintowhatwedo______benefitsourworkmost.A.whoB.whichC.thatD.what3.Itwasfromonlyafewsuppliesthatshehadboughtinthevillage______thehostesscookedsuchanicedinner.A.whereB.thatC.whenD.whic
7、h4.Itwas______hecamebackfromAfricathatyear______hemetthegirlhewouldliketomarry.A.when;thenB.not;untilC.notuntil;thatD.only;when5.–I’vereadanotherbookthisweek.–Well,maybe______isnothowmuchyoureadbutwhatyoureadthatcounts.A.thisB.thatC.the
