Unit2 I'llhelptocleanupthecityparks.第三课时 SectionA(GrammarFocus4c)多变的动词不定式todo一、用作宾语(v.+todo)宾语----动作的接受者Lucywantstocleanupthecityparks.Theydecidetovisitsickpeopleinthehospital.上面两句话中的动词不定式做_________.结构为_____________.常接动词不定式做宾语的动词有：不定式作宾语：plantododecidetodorefusetodoneedtodolearntodoagreetodobegintodostarttodotrytodoforgettodoremembertodoliketodostoptodogoontodo二、用作宾语补足语：(v.+sb.+todo)宾语补足语--对宾语加以补充说明的文字LilyhopestoteachchildrentospeakEnglishTheteacherwantstoaskstudentsnottospeakloudly.上面两句话中划线的动词不定式做_________.结构为_____________.动词不定式的否定形式是______常接动词不定式做宾语补足语的动词有：有些动词既可以接作宾语的不定式，也可以接做宾语补足语的不定式。wantsbtodowishsbtodolikesbtodowouldlikesbtodo三、用作目的状语Wegotheretocheerupthesickchildren.Shecallsatleastfiveprimaryschoolstoaskiftheyneedvolunteers.上面两句话中的动词不定式作_________.结构为_____________.Todo课后探究：一、作宾语补足语不带to的情况：Letmedoit.Isawhimcrossthestreet.常见动词有：使役动词:let,make,have感官动词:see,watch,hear,feel二、用作主语(可将其用形式主语it来替换)TobehereatChristmastimeismydream.→ItismydreamtobehereatChristmastime.三、用作
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语(说明主语身份，特征，属性或状态。)特征：找准系词，后面就是表语。系词分三类：1.各种be(am,is,are,was,were)2.感官动词(feel,look,sound,taste,smell)3.表示变化和不变的词(get,go,turn,become)Mywishistobeascientist.ThebestwayistojoinanEnglishclub.四、用作状语：状语----修饰动词，形容词，副词以及全句的句子成分，用作状语的通常是副词，介词短语，不定式和从句等。1）Iwenttheretoseemyteacher.(目的状语)2）原因状语，多用于“sb+be+adj.+todo……”结构中e.g.Ifeelhappytoknowhim.3）结果状语，多用于“sb+be+adj.+todo……”，“enoughto……”结构中e.g.Theboywastootiredtomove.五、疑问词who,what,which,where,when,how加todo可构成不定式短语,在句中可用作主语、宾语、宾语补足语、表语等。Whentostarthasnotbeendecided.Idon’tknowwhattodo.句子成分口诀：主谓宾定状补，句子成分要清楚。句子主干主谓宾，枝叶部分定状补。定语用在主宾前，谓前为状谓后补。还有助词的地得，帮助区分定状补。
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