高中英语 unit4主语从句课件 新人教版必修3.ppt

grammar iwonder mr adams ifyou dmindusaskingafewquestions ican tsaythatihaveanyplans thefactisthatiearnedmypassagebyworkingasanunpaidhand review grammar atreehasfallenacrosstheroad youareastudent tofindyourwaycanbeaproblem smokingisbadforyou 主语从句 在句中充当主语的从句叫做主语从句 1 连接词 1 从属连词 that whether等 that引导主语从句只起引导作用 本身无实际意义 在主语从句中不充当任何成分 但不能省略 thatshelefthimcuthimtotheheart thathewillcomeiscertain 2 连接代词who what which whatever whichever whoever whatseemseasytosomepeopleseemsdifficulttoothers whichsidewillwinisnotclear 由whether及其他连词引导的主语从句放在句首 句后都可 whetheritwillpleasethemisnoteasytosay 3 连接副词when where how why等 whyhediditremainsamystery whentheywillstartisnotknownyet howhebecameagreatscientistisknowntousall 主语从句后置 为了避免主语冗长 句子头重脚轻 经常用it作形式主语 主语从句放在后面作真正的主语 例 thatweshallbelateiscertain it scertainthatweshallbelate 1 thattheearthisroundisknowntoall 2 thatyoumissedthechanceisapity itisapitythatyoumissedthechance it sknowntoallthattheearthisround it be 形容词 that从句 itisnecessarythat 有必要 itisimportantthat 重要的是 itisobviousthat 很明显 it be ed分词 that从句 itisbelievedthat 人们相信 itisknowntous allthat 众所周知 ithasbeendecidedthat 已经决定 用it形式主语的that从句有以下四种不同的搭配 it be 名词 that从句 itiscommonknowledgethat 是常识itisasurprisethat 令人惊奇的是 itisafactthat 事实是 it 不及物动词 that从句 itappearsthat 似乎 ithappensthat 碰巧 itoccurredtomethat 我突然想起 注意 whatyouleftareonlyseveraloldbooks whatyousaidisofgreatimportance whetherhe llcomehereisnotclear 1 if 不能引导主语从句 应有 whether 引导 3 主语从句的 that 一般不能省 4 what 引导主语从句时 谓语动词 1 常与其后的名词作表语一致2 根据句子的语境而定 4 主语从句需注意的问题 2 主语从句中用陈述语序 makesentences it scertainthatwewillbelate thatwe llbelateiscertain wedon tknowwhetherheiscomingornot whetherheiscomingisnotknown wedon tknowwhathewantstotellus whathewantstotellusisnotknown whenyouwillcomebackdoesn tmatter itdoesn tmatterwhenyouwillcomeback 1 whereshallwespendtheholidayisn tdecided 2 youhavemadeamistakeisafact 3 thatiscertainthatwecanwin 4 nomatterwholeavestheroomlastoughttoturnoffthelights 5 ifthepolicemenwillcomeisnotcertain weshall thatyouhave itis whoever whether 改错练习 hemadeanimportantspeechatthemeetingwastrue a thatb whyc whatd how 2 we llgocampingtomorrowdependsontheweather aifbwhethercthatdwhere choosethebestchoice 3 itworriedherabit herhairwasturninggray whetherb thatc whatd when4 whatisayandthink noneofyourbusiness a isb arec hasdhave 1 youdon tlikehimisnoneofmybusiness 2 hesaidatthemeetingastonishedeverybodypresent3 the2000olympicgameswillbeheldinbeijingisnotknownyet 4 we llgocampingtomorrowdependsontheweather 5 leavestheroomlastoughttoturnoffthelights that what whether whether whoever 选择恰当的连接词 6 isafactthatenglishisbeingacceptedasaninternationallanguage 7 itworriedherabit herhairwasturninggrey 8 theforeignministersaid i