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初中英语什么是三单形式

爱拼才会赢

什么是三单形式?

疑点：什么是三单形式?

解析：三单形式：即第三人称单数，第三人称单数又可以称作‘三单形式’或‘单三形式’，意思都是一样的。人称：分为第一人称(我，我们)，第二人称(你，你们)，第三人称(他，他们) 第三人称单数：单指第三人称的‘他’，指‘他’一个人，单数就是指只有一个人。常见的第三人称单数包括：she ，he ， it ，还有名字(Mary、Jack)等。在一般现在时中，当主语是第三人称单数(he， she， it ，或人名 )时，谓语动词要用三单形式，也就是动词后面加s.(一般情况下是直接加s) 例：Tom often takes a walk after dinner.汤姆经常晚饭后散步。(Tom是一个人名，是第三人称单数，所以谓语动词take 需要加s变为takes) She is a beautiful girl.她是一个漂亮的女孩。(she是第三人称单数，所以be动词要用单数is)

注：‘三单形式’或‘单三形式’均是指第三人称单数，这一点大家要了解。另外，谓语动词变三单形式的规则大家要牢记。

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初中英语动词时态专项练习题用括号中动词的适当的形式填空。 1．The boy is happy because he ___________(sell) out all the newspapers. 2．The plan _____________(give) up because of rain. 3．If it __________(not rain) tomorrow, we ____________(go )fishing. 4．Where ____________you____________(be) these days? 5．Where is Tom? He _________(go) to the post office. He said he _________(come) back soon. 6．Mike says he _________(want )to be a worker after he _________ (finish )school. 7．The last bus ____________just ________(leave) when they ________(get) to the bus stop. 8．She _________(not go) to bed until she _______(finish) her work. 9．Light ___________(travel )much faster than sound. 10．I __________(feel) much better after I _______(take) the medicine. 11．”Where ________we________(meet)?” “Let’s meet outside the park gate.” 12．I_________(be) afraid Mr Johnson __________(not visit) out school tomorrow. 13．I _________(lost) my bike ._________you _________(see) it anywhere? 14．________this kind of car __________(produce) in Shanghai? 15．We __________(see) several members of the family since we ________(arrive)

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第8单元动词(一) （一）动词的种类动词是表示动作或状态的词，按其词义和在句子中的作用可分为行为动词，连系动词，助动词和情态动词。 1．行为动词行为动词可分为及物动词(vt)和不及物动词(vi)，及物动词表示动作或状态，有完整的词义，能单独作谓语，后跟宾语；不及物动词表示动作或状态，有完整的词义，能单独作谓语，但后面不能直接跟宾语，如要带宾语则与介词或副词构成短语。『例』 Thestudentsarelisteningtotheteachercarefully.(vi) 2．连系动词连系动词本身有一定的词义，但不能独立作谓语，必须与表语一起构成谓语。常用的连系动词有be,get,turn,become,look,feel,grow,seem,sound,taste,smell等。『例』 3．助动词助动词本身无词义，不能单独作谓语，只能和主要动词一起构成谓语动词，表示否定，疑问及动词的时态、语态、人称和数等语法特征，助动词有be,do,have,shall,will等。『例』 Thechildrenareplayingyo- 4．情态动词情态动词本身有一定的意义，但不能独立作谓语，只能和主要动词原形一起构成谓语，表示说话人的语气和情态。情态动词没有人称和数的变化。情态动词有can (could),may(might),must,need,oughtto,dare等。『例』CanIhelpyou? -Mustwegonow? –No,youneedn’t. a.can与beableto的用法有所区别。can只用于一般现在时和过去时，指本身有能力的“能”；beableto用于各种时态均可，指须经过努力而“能”。 b.must与have/hasto的用法。must表示说话人主观认为“必须”，只用于一般现在时和一般将来时；have/hasto表示客观需要，意为“不得不”，它可用于各种时态。 c．need和dare既可作情态动词也可作行为动词。（二）动词不定式动词不定式todo没有人称和数的变化，在句中不能独立作谓语，但可以和助动词或情态动词构成谓语，又可以在句子中作宾语、宾语补足语、状语、定语、主语、表语等。但它毕竟是动词，因此，具有动词的许多特点，如它可以有自己的宾语或状语构成不定式短语。 1．作主语：『例』但实际上不定式作主语常用it来作形式主语，而将不定式移至谓语动词后作真正的主语。