Unit 4 Breaking boundaries Grammar 学案-2022-2023学年高中英语外研版2019选择性必修第二册

Unit4Breakingboundaries(3)-Grammar本节重点Grammar本节难点It做形式主语教学内容教师复案备注学生学习笔迹【温故知新】1.___iswellknown__HongKongreturnedtoChinaonJuly1st,1997.2.Hemade__knowntohisfriendsthathedidn’twanttoenterpolitics.【知识展示】it作形式主语一、it作形式主语，代替不定式(短语)、动名词(短语)和主语从句当不定式(短语)、动名词(短语)、从句等用作主语时，为避免头重脚轻，通常在句首使用形式主语it，而把真正的主语放在句子末尾。1．代替主语从句(1)Itbe＋名词(apity，ashame，anhonour，agoodidea，amiracle，afact，commonknowledge，asurprise...)＋从句。ItisapitythatIcan'tgowithyoubecauseIhavetolookaftermylittlebrother.Itiscommonknowledgethattheearthturnsaroundthesun.(2)Itbe＋形容词(clear，possible，likely，natural，certain，fortunate，necessary，strange，uncertain，obvious，important...)＋从句。Itisobviousthattheyarefortheplan.(3)It＋不及物动词(happen，seem，appear，chance，occur，matter...)＋从句。Ithappened/chancedthatIwasinthecountrysideatthetime.Itseemsthatitisgoingtorainsoon.(4)It＋be＋过去分词(found，believed，reported，thought，noted，proved，known，decided，suggested，required...)＋从句。Itisreportedthatthefirecausedagreatlossandhundredsofpeopledied.(1)“It＋be＋said/believed/reported/...that...”句型一般可转换成“sb./sth.＋besaid/believed/reported/...＋不定式”句型。Itissaidthathehasgotadoctor'sdegree.＝Heissaidtohavegotadoctor'sdegree.(2)在句型“It＋is/was＋形容词＋主语从句”中，如果形容词是important，strange，natural，necessary等，从句谓语部分要用“should＋动词原形”形式，should可以省略。Itwasnecessarythatwe(should)makeeverythingreadyaheadoftime.(3)在“Itis/was＋过去分词＋that...”结构中，如果动词是require，demand，request等，从句谓语部分要用“should＋动词原形”形式，should可以省略。Itisrequiredthatnobody(should)smokehere.2．代替不定式(短语)ItishardtotranslatethissentenceintoEnglish.3．代替动名词(短语)It'snousearguingwithhim.二、it作形式主语和it用于强调句型的比较it作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化，可以是that，whether或连接代词、连接副词。而it强调句则是对句子某一部分进行强调，无论强调的是什么成分，都只能用连词that，若被强调部分指人时也可用who。试比较：Itisapitythatyoudidn'tgotoseethefilm.Itdoesn'tinterestmewhetheryousucceedornot.Itwasinthemorningthatthemurdertookplace.ItwasJohnthat/whobrokethewindow.【典例分析】Wasitonalonelyisland______hewassavedonemonthaftertheboatwentdown?【规律方法】1.形式主语句的构成与形式宾语句的构成3.强调句与形式主语句的区别4.it的其它句式【课堂检测】用it作形式主语改写句子1．Torememberthisruleisimportant.2．Lyinginthesuninwinterispleasant.3．Thatherhairwasturninggreyworriedherabit.【课后练习】1．我们在哪里开会都无所谓。2．学好英语不是件容易的事。3．在这儿等着是没有用的。4．据说她要出国学习法语。5．不可能及时赶到那里。【高考链接】1.Hedidn’tmake____clearwhenandwherethemeetingwouldbeheld.2.I’dappreciate_ifyouwouldliketoteachmehowtousethecomputer.学后思考教学反思得：失：

答案：【课后练习】完成句子1．It_makes_no_difference_whereweshallhavethemeeting.我们在哪里开会都无所谓。2．It'snoteasyto_studyEnglishwell.学好英语不是件容易的事。3．It'sno