湖北省宜昌市高中英语unit3ahealthylifepartiiigrammarit的用法学案（无答案）新

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1、Unit3AhealthylifePartIIIGrammarIt的用法一、【学习目标】1.能根据例句，分析并总结it的用法。2.把握it基本结构之后，会灵活运用。二、【基础知识】一、it用作人称代词［研读思考］(1)Thefrogisnotawarm-bloodedaniinal.It'sacold-bloodedone.-Whoisit?"—"It'sme."Theywatchedthetrainuntilitdisappearedinthedistance.Isthisyourdog?No,itisn't.Thisisournewcar・Iboughtityester

2、day.Theygotababyanditwasaten-poundbaby.Someonemusthavebeenhere.Butwehavenoideawhoitwas-HesmokesinbedandIdon'tlikeit.Hermotherkepttellinghernottogooutatnight,butitdidn"thelp.(10)Ihateitwhenpeopletalkwithafullmouth・•［结构归纳］it用作人称代词，主要代替,以避免重复；it也可指动物或性别不详的婴儿，如例句。It述用于指人主要用确定未知人的身份，如例句oIt还可指代前

3、句或后句所述的抽象事物或抽象环境和情景，如例句O［操练巩固］•有人在按门铃,LSomeoneisringingthedoorbell.Goandsee去看看是谁。shouldtakeaholiday,but2・ThedoctoradvisedVesastronglythatshe(work)医生建议强烈Vesa应该度假,但医生的建议没有效果。二、it用作非人称代词［研读思考］Itwasnear!ymidnightwhenshecameback.(3)ItisApri1Firsttoday.Itissome3000kilometersfromBeijingtoGuang/ho

4、u.is150Yuan.(6)Itisthree(5)—WhatTtisalovelyday,isn"tit?sthecostoftheT-shirt?—Itdollars.(7)Todayitis30degreescentigrade.(8)Itissummernow・(9)Itisabout5kilograms.(10)Itisnoisyhere.［结构归纳］Tt用作非人称代词，在以上10个例句中分别指代、、、、、、、、、、O［操练巩固］(1)Wearedeterminedtogetourrights(不惜代价).(cost)(2)Wemustovercomeevery

5、obstacle,(不管是什么困难)(whatever)(3)Chinaisnolonger(过去的样子了)(usedto)三、Tt做形式主语［研读思考］(1)It/simportantforthefigurestobeupdatedregularly.ItisdishonestofhimtosaythathehadadegreefromOxford・Itisourdutytokeeptheclassroomcleanandtidy・(2)It's/Thereisnousecomplsining(抱怨是毫无用处的),theyneverlisten.(3)Itisashame

6、thatyoucannotjoinusinthisreunion(聚会)(4)Itoccurredtome(我突然想起)thathemighthaveforgottenourdate.(5)Itisreportedthatanotherearthsatellitehasbeenputintoorbit(轨道).(6)Itturnedoutthat(结果)shewasafriendofmysiste(7)Itwilltakeheralongtimetorecoverfromtheillness.(8)Itremainstobeseenwhetherornothewillbee

7、lectedasmayorintwoyears'time.［结构归纳］It可以用作句子的形式主语，而把句子的真正主语移到后面去，句子的真正主语通常是：9,O常用的it作形式主语的句型如下：①It+be+adj./n.(forsb./ofsb.)+todosth.句型屮的形容词表示事物特点或特征吋用for；表示人的性格特征或特点用of.②Itisnousedoingsth./Thereisnouse(in)doingsth.做某事没有用Itisfundoingsth做很有趣Itisnogooddoingsth.做某事