2023学年完整公开课版【知识解析】To-infinitivesassubjectsandpredicatives

TospeakfluentChineseisdifficultforTamdrin.Everyartist’swishistocreatesomethingthatexpressesanidea.Figureoutthefunctionofthefollowinginfinitives.Grammar—To-infinitivesassubjectsandpredicativesTo-infinitivesassubjects(1)不定式的复合结构

(for/ofsb.todosth.)e.g.Itisimportant

forapersontostayhappyeveryday.Itwascareless

ofyoutoleavethingsabout.用法（1）动词不定式可在句中作主语，相当于名词或代词。（2）有时为了避免头重脚轻，往往用it作形式主语替代，将不定式放在句尾。Togrowtreesisveryimportant.

=Itisveryimportanttogrowtrees.Grammar—To-infinitivesassubjectsandpredicativesIt+be+adj.+forsb.todo:用forsb.时，形容词修饰todosth,形容词常用修饰事或物的词，如easy,difficult,hard,important,possible,impossible,comfortable等。It’sdifficultforhimtogiveupsmoking.=Togiveupsmokingisdifficultforhim.It+be+adj.+ofsb.todo:用ofsb.时，形容词修饰sb.，形容词常用修饰人品质的词，如nice,stupid,rude,clever,foolish,brave,silly等。It’skindofyoutohelpme.=Youarekindtohelpme.Grammar—To-infinitivesassubjectsandpredicatives(2)不定式的主谓一致

单个不定式作主语，谓语动词用单数。Tofindnewwaystosavewaterisanurgenttask.两个或两个以上不定式作主语，但语义基本一致或不定式作为一个整体时，谓语用单数。

Toloveandtobelovedissweettous.两个或两个以上不定式作主语，但语义不一致，谓语用复数。

Toimprovepeople’slivesandtospeedupsocializeconstructionaretwoimportanttaskstoday.Grammar—To-infinitivesassubjectsandpredicatives1.表示目的。例如：Thepurposeofeducationistodevelopafinepersonalityinchildren.

教育的目的是发展儿童良好的品格。2.用于第一人称疑问句中，表示征求意见。例如：WhatamItosayiftheyaskmethequestion?要是他们问我这个问题，我该怎么回答呢？Grammar—To-infinitivesassubjectsandpredicativesTo-infinitivesaspredicatives用法3.表示“同意、安排、命令、决定、劝告、意愿、禁止”等。例如：Theyaretomarrynextweek.他们将在下周结婚。（安排）Childrenarenottosmoke.儿童不准吸烟。（禁止）4.主动形式表示被动含义。例如：Sheistoblame.她应该被责备。Grammar—To-infinitivesassubjectsandpredicatives1.想要成功，就必须有耐心。______________________________________________________2.这些书不应该卖掉。______________________________________________________3.你那样做是不礼貌的。______________________________________________________4.对敌人仁慈就是对朋友残忍。_______________________________________________________5.对于他来说，说英语很容易。_______________________________________________________PracticeYoumustbepatientifyouaretosucceed.Thesebooksarenottobesold.Itisimpoliteofyoutodothat.Tobekindtoenemiesistobecrueltofriends.Translatethesentencesi