人教版选择性必修三DiscoverUsefulStructuresTheinfinitiveoftheverbusedasthesubjectUnit2HealthyLifestyle杭州二中许丽君

1.EnabletheSstomastertheusageoftheinfinitiveoftheverbasthesubject2.EnabletheSstousetherelevantgrammarflexiblyandauthenticallyintherealsituation.TeachingGoals

单元语法探究Lookatthefollowingsentencesandpayattentiontotheitalicizedinfinitives.Findmoreinfinitivesinthereadingpassage,andtelltheirmeaningsandfunctions.1.Tochangebadhabitsisnevereasy.2.Ittookthesurgeonthreehourstofinishmymother’slingsurgery.3.Tojointhepeople’sLiberationArmy,itisrequiredformentoshaveofftheirbeards.4.Itwasnotpolitetodisturbyourneighborswithloudmusiclastnight.

Moreinfinitivesinthereadingpassage1….itcanbeeasyforsomeofthemtoformbadhabits.2.Afterall,itisnoteasytobreakbadhabits.Theirmeaningsandfunctions动词不定式在句中做主语，有时为了保持句子的平衡，避免头重脚轻，常用it做形式主语，而真正地主语放在句子的末尾。比如第2；3；4例句。Grammaranalysis

TheInfinitive(todo……)Whatformsdoesinfinitivehave?Basicstrategy:Addtense时态andvoice语态into“todo”structure!

不定式的时态和语态：不定式主动被动?

一般towritetobewritten?

进行tobewriting?

完成tohavewrittentohavebeenwritten?

完成进行tohavebeenwriting?Grammaranalysis

4.Itisimportant______Tomtogetthatjob.Itiskind______youtohelpmewithmyhomework.1.______(talk)withhimisagreatpleasure.2.______(help)othersisourduty.TotalkTohelpItisourdutytohelpothersforof不定式作主语：3.Itiseasy______________________(学生读)forthestudentstoread.Grammaranalysis

TodoBe的单数形式Infinitiveasthesubjectofthesentence:不定式作主语Example1:Tohelpothersisourduty.主语系动词:表语Example2:Togetgoodgradesrequiresalotofhardwork.Todo主语谓语动词单数形式宾语Grammaranalysis

Infinitiveastherealsubjectofth