高二英语：Unit20 Archaeology课件（旧人教版下）1.ppt

theuseof it presshere it可用作人称代词 指示代词 先行词及引导词等 1 人称代词it 是第三人称单数中性 代表前文已提到过的一件事物 如 1 thatvaseisvaluable it smorethan200yearsold 当说话者不清楚或无必要知道说话对象的性别时 也可用it来表示 如 2 it salovelybaby isitaboyoragirl it可用来指代团体 如 3 thecommitteehasmetandithasrejectedtheproposal it用以代替指示代词this that 如 4 what sthis it sapen 2 指示代词it 常用以指人 如 5 goandseewhoitis 6 whoismakingsuchanoise itmustbethechildren 3 it常用作没有具体意义的主语 表示天气 气候 温度 时间 地点 距离等意义的句子中 it shalfpasteightnow it sonlyhalfanhour swalkfromheretoourschool ihopethatitwillbefinetomorrow ithasrainedmuchthisyear it sspringnow it squiethere time distance weather weather season circumstance it也常用来表示一般的笼统的情况 9 it sawful i vegotsomuchworkidon tknowwheretostart 10 takeiteasy it也常用于下列结构 11 itlooksasifthecollegeisverysmall 12 itseemsasthoughourplanwillbeperfect 13 it smyturn 14 itissaidthattheboatsankafterhittinganiceberg 15 itisreportedthat 16 itisbelievedthat 4 it充当形式主语或形式宾语 本身无意义 1 用作形式主语15 itisdifficulttotranslatethisarticle 16 itisnousegoingtheresoearly 17 itisstrangethathedidnotcomeatall 在上述诸例中 后置的真正主语可以取代先行it的位置 而出现于句首 totranslatethisarticleisdifficult goingtheresoearlyisnouse thathedidnotcomeatallisstrange 此外 也并非所有先行it结构都可作上述转换 如 19 itseemsthatjohnisnotcomingafterall 20 ithappenedthatjohnwastheonlywitness 上述两例只能转换为 johndoesn tseemtobecomingafterall johnhappenedtobetheonlywitness 2 形式宾语21 ifounditdifficulttoexplaintohimwhathappened 22 hethoughtitnousegoingoverthesubjectagain 23 theykeptitquietthathewasdead 24 wemustmakeitcleartothepublicthatsomethingshouldbedonetostoppollution 5 用于强调句型中 it be 被强调部分 that who aperson 从句 imettomintheparkyesterday 1 itwasiwhomettomintheparkyesterday 2 itwastomwhoimetintheparkyesterday 3 itwasintheparkthatimettomyesterday 4 itwasyesterdaythatimettominthepark itwasfiveo clock igothome itwasatfiveo clock igothome when that 1 hedidn tcomebecausehewasill itwasbecausehewasillthathedidn tcome 2 shedidn tgotobeduntilherfathercameback itwasuntilherfathercamebackthatshedidn tgotobed wrong notuntilherfathercamebackdidshegotobed itwasnotuntilherfathercamebackthatshewenttobed 1 冬天 天色晚得早 2 问她没有用 3 从这儿到车站有两英里 路程 itisgettingdarkearlierinwinter itisnouseaskingher it stwomilesfromheretothebusstation itissaidthathehasbeentotheu s a twice itseemsthatheismuchafraid itwasseveralmonthsbeforewemetagain 6 据说他已去过美国两次了 7 看来 他很害怕 8 几个月之后我们才又见面 1 ittookusoveranhour alongthestreet a walkb towalkc walkingd walked2 ithinkitagreathonor tovisityourcounty a toinviteb invitingc havinginvitedd tobeinvited3 manypeoplenowmake aruletobuycardsfortheirfriendsbeforechristmas a themselvesb itc thatd this 5 intheunitedstates bustraveldoesn tcostmuchastraintravel a don ttheyb doesitc dotheyd doesn tit6 someoneisatthedoor whois a thisb thatc itd he7 raininghardforthreehourswithoutstopping a itisb itwasc ithasbeend ithadbeen 9 itisimportant theiroffer a rejectb rejectsc torejectd rejecting10 has beendecidedwhenwearetoholdthesports meeting a thatb thisc itd what11 didlileicallmewhileiwasout yes itwas thatcalledyou a himb hec whod whom 1itismoderntechnologythatmakesitpossibletofindoutmoreaboutthemaninthegrave 2itisthetestsonhisteeththatshowthathespenthisyouthincentraleurope 3itwasinthebronzeagethatpeoplecouldmaketoolsofcopperandbronze 4itwaswestwaleswherethesmallerbluestonescamefrom suggestedanswerstoexercise1 p78 itwassaidthatitwasanimportantarcheologicaldiscovery itwasreportedthatthismanhadasonwhogrewupinscotland itisbelievedthatthetwogoldearringsfoundonthemanaretheoldestgoldeverfoundinbritain itisthoughtthateuropeancultureandtechniqueswerebroughttobr